Global one-stop procurement platform for industrial spare parts.
support01@okmarts.com service@okmarts.com hydraulic@okmarts.com
Okmarts.com Online Store, Refrigeration Compressor Price, O&Kmarts Logo
Max 200 characters
Display the website inEN
EN
translate to EN
EN
translate to ES
ES
translate to العربية
العربية
All
YUKEN
YUKEN
  • Solenoid Valve
    Solenoid Valve
  • Overflow Valve
    Overflow Valve
  • Vane Pump
    Vane Pump
  • Piston Pump
    Piston Pump
  • Gear Pump
    Gear Pump
ANSON
ANSON
  • Vane Pump
    Vane Pump
Parker Denison
Parker Denison
  • Vane Pump
    Vane Pump
Villefort
Villefort
  • Vane Pump
    Vane Pump
KEISTER
KEISTER
  • Vane Pump
    Vane Pump
NACHI
NACHI
  • Solenoid Coil
    Solenoid Coil
  • Check Valve
    Check Valve
  • Vane Pump
    Vane Pump
  • Piston Pump
    Piston Pump
  • Tool for Metal Cutting
    Tool for Metal Cutting
  • Bearing
    Bearing
All Brands
All Brands
    • a
    • b
    • c
    • d
    • e
    • f
    • g
    • h
    • i
    • j
    • k
    • l
    • m
    • n
    • o
    • p
    • q
    • r
    • s
    • t
    • u
    • v
    • w
    • x
    • y
    • z
    • 3
    • 7
      Top Picks
      • Parker Denison Vane Pump T7BBS-B02-B09-1L00-A4M1
      1/1
      Parker Denison Vane Pump T7BBS-B02-B09-1L00-A4M1

      There is no price at present, you can Request a Quote

      • Specifications
      • Q&A
      • Reviews
      The Parker Denison Vane Pump is high quality!
      We can also provide the following models
      T7DDBS-B38-045-B14-2R00-A4-00
      T7DDBS-B31-B42-B09-4L00-A5-M1
      T67EDCS-072-B24-014-3L00-A5-01
      T67EDCS-042-B17-006-3L00-A5-M0
      T7EE-054-062-2L00-A43-M0
      T7EDB-062-B22-B06-1R00-A5-M1
      T6CC-006-014-3R00-C501
      T7DDS-B14-B14-4R00-A5-00
      T7DDBS-B35-B17-B11-3R00-A4-M1
      T67DDCS-B35-B42-006-4L00-A4M1
      T6CR-022-1L00-010-A4
      T7EDB-050-B28-B06-1R00-A1-M0
      T7DDBS-B17-B14-B03-3R00-A1-01
      T7DDBS-B42-050-B08-3R00-A5-01
      T7DDBS-B42-045-B09-4L00-A5-00
      T7EES-057-066-2R00-A43-M0
      T7DDBS-B24-B24-B05-3L00-A5-01
      T67DDCS-050-050-005-5R00-A501
      T7DDBS-B14-B35-B12-5R00-A4-M1
      T7DDBS-045-B38-B02-4R00-A4-M1
      T7EDB-045-045-B05-1R00-A1-M0
      T7EDB-066-B28-B11-1R00-A1-M0
      T67DDCS-050-B24-022-3R00-A1M0
      T67DDCS-045-B22-020-5R00-A5M1
      T7DDBS-B20-B22-B14-4L00-A1-00
      T7EDBS-072-050-B12-2R00-A1-01
      T7DDBS-B28-B28-B15-1R00-A4-00
      T67DDCS-B38-B42-006-3L00-A500
      T67DDCS-B31-050-017-2R00-A1M1
      T6CC-017-008-5L00-C500
      T7EBS-085-B14-5L00-A5M1
      T7DDBS-B22-045-B14-1L00-A1-00
      T67DDCS-050-045-031-4L00-A5M0
      T67EC-057-020-1L00-A5M1
      T6DCCM-B42-B28-***-1R00-B4-M0
      T7DDB-B24-B14-B11-5L00-A1-M1
      T67DDCS-045-B35-010-5R00-A5M1
      T6CCMW-B10-***-RR00-D4-11
      T7DDBS-B42-B28-B02-3L00-A5-01
      T7DDBS-B42-B24-B08-3R00-A1-01
      T7DDBS-B17-B17-B09-5R00-A5-M1
      T67EC-050-012-4R00-A5M0
      T6CCZ-B10-B14-XR00-A-10M
      T67EDCS-054-B20-017-3L00-A4-00
      T67DDCS-B35-B42-014-1R00-A1M1
      T7DDBS-045-B28-B02-5L00-A5-M0
      T6DR-050-1L00-A10-A1
      T67DDCS-B35-B20-020-5R00-A5M1
      T7EDBS-072-B20-B14-2L00-A5-01
      T7EDBS-052-B38-B15-2L00-A5-M1
      T67EDC-062-050-020-1R00-A4-M0
      T67EDC-072-B22-006-1L00-A1-M0
      T67EDCS-066-B14-017-2R00-A1-M1
      T7EDBS-085-B20-B05-3L00-A1-00
      T7EDB-072-B24-B08-1R00-A4-M1
      T7DDS-B31-B20-5R00-A4-00
      T67DDCS-B38-B20-028-1L00-A101
      T7DDBS-045-B28-B11-4L00-A5-M1
      T7EBS-057-B15-2L00-A401
      T6ED-066-B38-4R00-B1
      T7EDS-072-B24-3R00-A5-00
      T7DDBS-B14-B22-B06-1L00-A4-M1
      T6DR-050-2L00-010-A5
      T7BBS-B08-B15-5R00-A5M1
      T7DDBS-B42-B22-B05-3L00-A5-M0
      T6DCC-B24-B17-***-3R00-A1-01
      T67EDCS-045-B17-031-2L00-A1-01
      T7DDBS-B24-B22-B15-3R00-A5-00
      T6DCW-B50-B06-1R00-B4
      T7DDBS-B28-045-B03-2L00-A4-M1
      T6DR-035-2R00-016/320-A1
      T7BBS-B08-B09-4R00-A501
      T67DDCS-B35-B35-008-5L00-A1M1
      T7EDBS-050-045-B14-2R00-A1-01
      T7DDBS-B24-B38-B10-1R00-A5-01
      T7DDBS-B24-050-B02-4R00-A1-M0
      T7DDBS-B17-B22-B15-1R00-A4-01
      T67EC-066-010-3R00-A400
      T7DDBS-B17-B28-B12-1L00-A5-01
      T7DDBS-B22-B42-B09-3L00-A4-M1
      T7DBS-B35-B15-2L00-A5M1
      T7EDBS-085-B42-B03-3R00-A5-00
      T6CC-006-014-3L00-C101
      T7BBS-B08-B10-5R00-A5M0
      T67EDCS-057-B17-012-3R00-A4-M1
      T7DDB-B24-B31-B09-5R00-A1-M1
      T6DCCR-031-006-***-3R00-A4-01
      T7DDB-B14-B24-B11-5L00-A1-M0
      T7DBS-B28-B07-2L00-A4M0
      T7DDBS-B20-B38-B14-5L00-A4-M1
      T7DDBS-045-B24-B12-3R00-A5-01
      T7DDBS-B14-B38-B04-5L00-A4-M0
      T7EDBS-042-B42-B15-2R00-A4-M0
      T7DDBS-045-B28-B12-1L00-A4-00
      T7EDBS-042-B22-B14-2R00-A1-00
      T7EDBS-054-B28-B15-2L00-A4-M1
      T67EDCS-062-B31-028-2R00-A4-M1
      T67DDCS-B35-B31-006-4L00-A100
      T67EDCS-050-B20-008-3L00-A4-00
      T7EB-050-B07-5L00-A5M1
      T7DDBS-B14-B35-B04-1R00-A5-M0
      T6DR-017-2L00-C40-A4
      T6EDCS-052-B38-***-3L00-A1-P1
      T7EES-050-072-2L00-A12-M0
      T67DDCS-B35-B42-010-3L00-A401
      T7EDBS-072-045-B06-2R00-A5-M1
      T67EDCS-085-B22-028-3L00-A1-00
      T7DDBS-B22-B24-B12-4R00-A1-M1
      T6EDCM-042-B24-***-3L00-A5-P1
      T7EDBS-050-B35-B10-3R00-A1-01
      T67DDCS-B35-B38-014-1R00-A5M1
      T7BBS-B11-B10-4R00-A100
      T7EDB-057-B17-B02-1R00-A4-M0
      T67EDCS-072-B20-005-2L00-A4-M0
      T7BB-B07-B15-5L00-A5M0
      T67DDCS-B35-B14-020-1R00-A5M1
      T6ER-072-1R00-C30-A5
      T67DDCS-050-B35-008-2L00-A4M1
      T7DDS-B31-B22-5L00-A1-00
      T7EDBS-042-B22-B09-2R00-A4-M0
      T7DDS-B42-045-2R00-A4-00
      T7DDBS-B22-B35-B03-4R00-A4-M1
      T67EDCS-072-B22-010-2R00-A5-M1
      T67EDC-085-B31-025-1R00-A5-M1
      T67EDCS-072-B24-003-3L00-A4-M1
      T67DDCS-045-B35-010-1L00-A400
      T7DDBS-B14-B14-B07-4R00-A1-M0
      T7DD-B28-B22-5L00-A1-M0
      T7DDBS-B22-B17-B12-2L00-A1-01
      T7DBS-B42-B02-1L00-A1M1
      T67EDC-072-045-012-1L00-A4-M1
      T7BBS-B14-B14-3R00-A4M0
      T7EDBS-050-B42-B02-2L00-A5-01
      T7BBS-B12-B10-2L00-A5M1
      T7EDBS-057-B35-B08-2L00-A1-M0
      T67EDCS-072-B38-006-3R00-A4-01
      T67DDCS-B38-B42-005-1R00-A401
      T67EDCS-050-B35-012-3L00-A4-01
      T67DDCS-B38-B38-014-4L00-A1M1
      T67DDCS-B38-B20-008-4L00-A4M1
      T7DDBS-B17-B24-B15-2R00-A1-00
      T67DDCS-050-050-010-4R00-A5M0
      T67DDCS-B35-045-028-5L00-A101
      T67DDCS-B38-B35-017-4R00-A100
      T7EDB-066-045-B07-1L00-A4-M0
      T67EDCS-042-B14-020-2L00-A5-00
      T7DDBS-B28-B24-B05-5R00-A5-M1
      T6DCCM-B20-B10-***-3L00-B4-M1
      T7EDBS-072-B14-B06-2R00-A5-M1
      T6ERY-062-3L00-050-A4
      T7DDBS-B28-045-B06-2R00-A5-01
      T6CCW-020-012-2L00-C111
      T7EES-045-054-4L00-A40-M0
      T6ER-062-1R00-B20-A5
      T7DDS-B20-B35-5R00-A1-M0
      T7DDBS-B17-045-B06-2R00-A4-01
      T67EDC-052-B14-017-1L00-A5-M1
      T6CR-012-1L00-B30-A5
      T7DD-B22-B22-5L00-A4-M0
      T7DDBS-B35-B14-B04-2L00-A5-M0
      T7EDBS-052-B17-B15-3L00-A4-M0
      T7EDB-054-B14-B14-1R00-A4-M1
      T6CRY-003-5L00-A40-A5
      T6CR-017-1L00-010-A5
      T67EDCS-054-B35-003-2L00-A1-00
      T67EDC-057-045-003-1L00-A5-M0
      T7DDB-B17-B17-B15-5L00-A1-M1
      T7DDS-B14-B14-5L00-A4-00
      T7DDBS-B22-B35-B04-5R00-A5-00
      T6DCCR-050-012-***-2L00-A4-00
      T6CCP-B12-***-6L00-D5-11
      T67DDCS-050-B22-006-2L00-A1M0
      T6DR-014-5R00-020-A1
      T67EC-045-010-4L00-A101
      T7EDBS-052-B20-B04-2L00-A1-01
      T7DDBS-B14-050-B06-2R00-A5-M1
      T67EDCS-054-B31-010-2L00-A4-M0
      T67DDCS-B35-050-014-1R00-A4M1
      T7DDBS-B14-B42-B02-3R00-A4-M0
      T7DDB-B14-B35-B04-5L00-A5-M0
      T67DDCS-050-B17-012-3R00-A100
      T7EDS-085-045-3L00-A1-M0
      T7EDB-066-B22-B08-1R00-A4-M0
      T7EBS-057-B09-5L00-A5M1
      T7DDBS-B38-B35-B08-5R00-A5-00
      T67DDCS-045-B20-020-2L00-A500
      T67DDCS-B42-B20-028-1L00-A5M1
      T7DDBS-B20-050-B15-4R00-A5-00
      T7DDBS-B17-B22-B08-4L00-A1-01
      T7DDBS-B31-045-B12-5L00-A1-01
      T67DDCS-B42-045-017-4L00-A100
      For more information,please contact us freely

      Ask questions

      (0/1,200)

      Max 1200 characters

      • Q: Are there size restrictions for international shipping?

        A: International shipping may have size and weight restrictions depending on the destination country and shipping carrier's policies. During the checkout process, the available shipping options and any size restrictions will be displayed based on the dimensions and weight of the items in your cart.

      • Q: What should I do if I forgot my password?

        A: If you forgot your password, click on the "Forgot Password" link on the login page. Follow the instructions to reset your password.

      • Q: Can I save my payment information for faster checkout?

        A: We prioritize the security of your payment information and do not store sensitive payment details on our servers. However, you may have the option to securely save your payment information with trusted third-party payment processors for faster checkout on future orders.

      View More
      Question has been sent successfully

      Reviews

      • A

        Anonymous user

        Nov 25, 2022

        Parker Denison Vane Pump T7BBS-B02-B09-1L00-A4M1
        All was ok! No problems whatsoever.
        Helpful
        Unhelpful

      Parker Denison Vane Pump T7BBS-B02-B09-1L00-A4M1

      There is no price at present, you can Request a Quote

      People who bought this item also viewed

      New In stock for sale, Parker Denison Vane Pump T6C-012-1R00-A1

      Parker Denison Vane Pump T6C-012-1R00-A1

      US$999.00
      New In stock for sale, Berarma Vane Pump 02-PVS05-12-F-K-R-M

      Berarma Vane Pump 02-PVS05-12-F-K-R-M

      US$900.00
      New In stock for sale, YUKEN Vane Pump EFBG-06-250-H-20T145

      YUKEN Vane Pump EFBG-06-250-H-20T145

      US$923.00
      New In stock for sale, YUKEN Vane Pump PV2R12-19-65-L-REAA-41

      YUKEN Vane Pump PV2R12-19-65-L-REAA-41

      US$1671.88
      New In stock for sale, YUKEN Vane Pump PV2R34-116-237-F-REAA-31

      YUKEN Vane Pump PV2R34-116-237-F-REAA-31

      US$2539.06
      New In stock for sale, Festo Proportional Valve VPPM-6TA-L-1-F-0L2H

      Festo Proportional Valve VPPM-6TA-L-1-F-0L2H

      US$584.62
      New In stock for sale, NACHI Check Valve OCP-G01-W2-F-21

      NACHI Check Valve OCP-G01-W2-F-21

      US$134.62
      New In stock for sale, Nachi Overflow Valve ORD-G01-W3-20

      Nachi Overflow Valve ORD-G01-W3-20

      US$376.92
      New In stock for sale, VICKERS Piston Pump PVM098ER09ES04AAA00000000

      VICKERS Piston Pump PVM098ER09ES04AAA00000000

      US$1071.43
      New In stock for sale, Casappa Gear Pump PLP10.8D0-81E1-LBB-BA

      Casappa Gear Pump PLP10.8D0-81E1-LBB-BA

      US$788.46

      Customers frequently viewed

      New In stock for sale, IWAYA DENKI Water Pump 25CJT0752

      IWAYA DENKI Water Pump 25CJT0752

      US$2307.69
      New In stock for sale, Panasonic Servo Motor MHMF022L1V2M

      Panasonic Servo Motor MHMF022L1V2M

      US$653.85
      New In stock for sale, Honeywell Solenoid Valve VE4025B1045

      Honeywell Solenoid Valve VE4025B1045

      US$334.62
      New In stock for sale, ROTEN Mechanical Seal 8E5K-22-X

      ROTEN Mechanical Seal 8E5K-22-X

      US$384.62
      New In stock for sale, SANDSUN Overload Pump VA08H-760

      SANDSUN Overload Pump VA08H-760

      US$1568.40
      New In stock for sale, GS Battery 6-QW-60(450)-(55D23L-KR)

      GS Battery 6-QW-60(450)-(55D23L-KR)

      US$646.15
      New In stock for sale, Rechi Compressor 44R273A

      Rechi Compressor 44R273A

      US$341.00
      New In stock for sale, Bosch Rexroth Linear Guideway Runner Block R165381920

      Bosch Rexroth Linear Guideway Runner Block R165381920

      US$107.69
      New In stock for sale, MINDMAN Air Cylinder MCQV2-11-40-200

      MINDMAN Air Cylinder MCQV2-11-40-200

      US$88.46
      New In stock for sale, Mitsubishi Compressor YB645WTG

      Mitsubishi Compressor YB645WTG

      US$549.00
      New In stock for sale, Copeland Compressor CR18KQE-TFZ-226WB

      Copeland Compressor CR18KQE-TFZ-226WB

      Contact Us
      New In stock for sale, Festo Sensor SMEO-8E-K-24-S6

      Festo Sensor SMEO-8E-K-24-S6

      US$138.00
      New In stock for sale, Festo Solenoid Coil MSFG-42DC-OD

      Festo Solenoid Coil MSFG-42DC-OD

      US$39.06
      New In stock for sale, Danfoss Expansion Valve AKVA15-1

      Danfoss Expansion Valve AKVA15-1

      Contact Us
      New In stock for sale, DKM Electric Motor 9SDGC-60FP

      DKM Electric Motor 9SDGC-60FP

      Contact Us
      New In stock for sale, Schneider Servo Motor BCH1001O12F1C

      Schneider Servo Motor BCH1001O12F1C

      US$1346.15
      New In stock for sale, SKF Bearing NU 1019 ECM

      SKF Bearing NU 1019 ECM

      US$73.08
      New In stock for sale, Copeland Compressor 6MM1-300-EWL

      Copeland Compressor 6MM1-300-EWL

      Contact Us
      New In stock for sale, KOGANEI Solenoid Valve F15T5-CPS3

      KOGANEI Solenoid Valve F15T5-CPS3

      US$33.85
      New In stock for sale, Copeland Compressor ZH150KCE-TEJ-556

      Copeland Compressor ZH150KCE-TEJ-556

      Contact Us

      Recent related posts

      Hydraulic Solenoid Valve | How to Solve the Oil Leakage of the Hydraulic System?

      06/17/2024

      Hydraulic Solenoid Valve | How to Solve the Oil Leakage of the Hydraulic System?

      For a hydraulic system, which uses hydraulic oil as the medium to transmit power and energy, oil leakage may occur during its work process.

      Apply these 5 parameters to easily determine whether the refrigeration and air conditioning system is operating normally!

      07/31/2020

      Apply these 5 parameters to easily determine whether the refrigeration and air conditioning system is operating normally!

      Condensing pressure is the pressure at which the refrigerant condenses into liquid in the condenser. Since the pressure inside the condenser in the refrigeration system cannot be measured, in fact, the pressure drop of the refrigerant in the exhaust pipe and the condenser is actually very small.

      High-end screw air compressors can be sold at high prices

      09/09/2020

      High-end screw air compressors can be sold at high prices

      1. Firmly funded enterprise users focus on comprehensive cost performance. They often use the functional price analysis method of technical economics in internal decision-making. This method adopts experts in product functions, brand, reliability, energy efficiency, environmental impact, price and other items.

      Tips for troubleshooting the refrigeration system of low-temperature chillers

      08/14/2020

      Tips for troubleshooting the refrigeration system of low-temperature chillers

      Regular maintenance work for the low-temperature chiller, while troubleshooting the refrigeration system of the low-temperature chiller is also very important.

      Current Status and Experimental Research of New Type Compressor Lubricant

      08/26/2020

      Current Status and Experimental Research of New Type Compressor Lubricant

      Newly developed high-quality products The high performance and reliability of the compressor not only depend on the design and manufacturing process of the compressor itself, but also have a lot to do with the compressor oil used for the new compressor.

      Characteristics of Market Operation of Contract Energy Management

      09/09/2020

      Characteristics of Market Operation of Contract Energy Management

      EMC's energy system transformation uses contract energy management mode to serve customers, which overcomes the current energy-saving work faced by my country, such as: lack of corporate energy-saving investment awareness, insufficient energy-saving investment funds, low-efficiency energy-saving projects "headache" and system efficiency.

      Danfoss introduces TTH/TGH compressor for higher lift applications

      06/16/2020

      Danfoss introduces TTH/TGH compressor for higher lift applications

      Danfoss introduces TTH/TGH compressor for higher lift applications Danfoss, the world’s leading manufacturer of oil-free compressor technology, offers a new range of compressors that can operate in demanding high lift applications. The new Danfoss Turb器2䀀ᅵ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔDž༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ᅵ皥ب巠皱㙲皦忈皱੨皦柘皱

      Air-conditioning repair book Three nirvana tricks that can't be charged by the regular army

      08/20/2020

      Air-conditioning repair book Three nirvana tricks that can't be charged by the regular army

      Summer is the peak season for air-conditioning to be turned on. After frequent use, the air-conditioning in some consumers’ homes will fail, and when a small partner is in a hurry, they will “see the doctor in a hurry”.

      Selection of refrigeration piping parts for chillers

      08/18/2020

      Selection of refrigeration piping parts for chillers

      The accessories of the refrigeration pipeline of the chiller mainly include various valves and connectors. According to different refrigeration systems, chillers have different requirements for piping accessories.

      What Causes AC Compressor Failure and How to Prevent It? (11 Reasons&4 Ways)

      08/03/2025

      What Causes AC Compressor Failure and How to Prevent It? (11 Reasons&4 Ways)

      The AC compressor is an essential component of an air conditioning system, responsible for compressing and circulating refrigerant that cools down the air.

      • Welcome to O&Kmarts

        Is there anything we can help?

        Email us
      • Feedback

      Join in

      Join in to enjoy exclusive discounts and give you greater discounts

      See More About O&Kmarts Member
      Sign up now

      Common Problem

      Payment Methods
      Shipping Guide
      Sales and Refund Policy
      FAQs

      About O&Kmarts

      About Us
      Membership

      Website Terms

      Privacy Policy
      Terms Of Use
      Bidding Agreement
      Review Rules

      Customer Service

      support01@okmarts.com
      service@okmarts.com
      hydraulic@okmarts.com
      +86-28-84166335
      GMT+08:00 Mon-Fri, 9:00 AM-7:00 PM
      Customer Feedback

      POPULAR PRODUCTS :

      DIFU Vane Pump Daikin Vane Pump Villefort Vane Pump YUKEN Vane Pump TCMC Vane Pump NACHI Vane Pump OUYIPU Vane Pump Rexroth Vane Pump ANSON Vane Pump Furnan Vane Pump VDR-11B-1A2-1A2-13 50T-17-F-R-S1 V20-1S7S-1C11 PV2R12-19-59-F-RAAA-41 DVSF-4V-20 25CJT0752 MHMF022L1V2M VE4025B1045 8E5K-22-X VA08H-760 ad0812ub a70gl ad0924hb a70gl AFB1212SHE CKD 3GB1669R-00-A2N-3 CKD 4GA110-E2H Copeland CR47KQ-PFZ-290BB Delta NC55C02-15K14 e40s6 1024 3 t 24 FUJIKOKI DC12V HRSZ-104R 7R1 HONEYWELL V4ABFW16-125-012 jt300d y1l mf50060v1 Mitsubishi BN65YEAMT Sanyo Denki 9SG1248P1G09 sdr 480 24 SMC SQ1241D-5L01-L6-B-X91 Tecumseh CAE4440A Tecumseh CAJ4511A TOKYO KEIKI EPFRCG-06-175-500-EX-10-S7 YB645RTD

      Disclaimer: All brand names, model or type numbers or marks listed on the website are owned by their respective manufacturers. These terms are used for identification purposes only and are not intended to indicate affiliation with OEM companies. Product pictures shown on the website are for illustrative purposes only and the actual item may vary in design, specification, etc. Confirm at the time of purchase if you are unsure.

      © eCommerce. 2017-2025. All Rights Reserved
      © eCommerce. 2017-2025. All Rights Reserved
      Press and drag the mouse to start taking a screenshot