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 T7DDBS-B31-B28-B04-3L00-A1-01
      1/1
      Parker Denison Vane Pump T7DDBS-B31-B28-B04-3L00-A1-01

      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
      T67DDCS-045-B35-008-2L00-A101
      T7DDBS-B28-B42-B14-1R00-A1-M1
      T67DDCS-B35-B28-006-1R00-A400
      T7DDBS-B31-B24-B14-2L00-A5-M0
      T7EDBS-085-B42-B09-3R00-A5-00
      T67EDCS-042-B31-010-2R00-A4-00
      T7BBS-B15-B10-3R00-A400
      T67EDCS-085-B24-028-3L00-A4-00
      T7EDBS-042-B28-B12-2R00-A5-00
      T67DDCS-B42-B22-017-1L00-A5M1
      T7EBS-066-B14-5R00-A501
      T7EDBS-066-B28-B03-2L00-A4-01
      T7EDBS-042-B14-B09-2R00-A4-01
      T6DCC-B42-B25-***-3R00-A5-00
      T7EDBS-050-050-B14-2R00-A5-M0
      T7EDS-062-B35-2R00-A1-M0
      T7DDBS-B17-B31-B05-5L00-A4-01
      T7DDBS-B38-B17-B09-1R00-A5-M0
      T67EDCS-054-B20-008-2L00-A5-M1
      T7DDBS-B28-B28-B04-4L00-A1-00
      T7DDBS-B14-B42-B07-1L00-A1-00
      T7DDBS-B28-045-B09-4L00-A5-00
      T7DDBS-B22-B22-B07-4R00-A5-01
      T7DDBS-B28-050-B05-3R00-A5-M1
      T7DDBS-B22-B24-B02-2R00-A5-00
      T6DCCM-B17-B03-***-1L00-B4-01
      T7DDBS-B14-B14-B12-1R00-A1-M0
      T67EDC-062-B14-022-1R00-A4-M0
      T67EDCS-072-050-031-2R00-A5-00
      T7DDB-B20-B38-B06-5R00-A1-M0
      T67DDCS-B35-B28-003-1R00-A501
      T7EDBS-072-B24-B15-2R00-A4-M0
      T7DDBS-B24-B17-B07-3R00-A1-M1
      T7DDBS-B35-B31-B11-3R00-A4-00
      T6CCZ-B08-B08-WR00-A-101
      T67EDCS-072-050-012-2L00-A4-01
      T7DDBS-B31-B28-B09-5L00-A1-M1
      T7DDBS-B31-B24-B02-1R00-A5-00
      T6DR-042-2L00-C50-A1
      T6DR-028-3L00-C10-A1
      T7EDBS-085-B24-B03-3R00-A4-00
      T67EDCS-050-B14-014-2L00-A1-00
      T67EDC-042-B17-025-1R00-A5-M0
      T67EDCS-085-B31-022-2R00-A5-01
      T7DDBS-B17-B38-B09-5L00-A1-M0
      T67EDCS-062-B35-003-3L00-A5-M0
      T7EBS-050-B04-3R00-A101
      T67DDCS-B38-050-022-1L00-A1M0
      T67EDCS-072-050-020-2R00-A1-00
      T7DDBS-B35-B20-B06-3L00-A1-M1
      T7DDBS-B14-B22-B14-1R00-A1-01
      T67EDCS-085-B14-020-3L00-A4-00
      T7EDB-045-B28-B02-1L00-A4-M1
      T67EDCS-057-B22-008-3R00-A5-00
      T7DDBS-050-B35-B12-5L00-A5-01
      T67EDC-066-B14-012-1L00-A4-M1
      T67EDC-062-B17-025-1R00-A4-M1
      T7DDBS-B38-050-B12-1L00-A5-M1
      T7DDBS-050-B42-B04-1L00-A5-01
      T6DCCM-B45-B03-***-2L00-B1-00
      T7DBS-B42-B05-2R00-A4M1
      T67DDCS-B38-B42-020-4R00-A100
      T67DDCS-050-B42-005-4L00-A5M1
      T67EDC-054-B24-020-1R00-A1-M0
      T7DDBS-B38-B22-B14-4L00-A1-M0
      T7EDBS-042-B20-B10-3R00-A5-M0
      T7DDBS-050-B22-B15-4R00-A1-M0
      T7DDBS-B31-B31-B05-4R00-A4-00
      T7DDBS-B14-B17-B07-4L00-A1-00
      T7DDBS-B14-B42-B12-2R00-A4-00
      T67EC-042-008-2L00-A4M0
      T7DDBS-B20-B28-B03-4R00-A4-M1
      T7DDBS-045-B28-B06-1L00-A1-00
      T7EBS-042-B06-2L00-A101
      T67EDCS-054-B38-003-3L00-A5-M1
      T6CRY-017-3R00-040-A5
      T67DDCS-045-B28-025-3L00-A100
      T7EDBS-057-B22-B11-2R00-A4-00
      T7DDBS-B42-B20-B05-3L00-A4-01
      T7EES-062-045-5L00-A50-00
      T6ED-072-B38-2L00-B4
      T7DDBS-B14-B17-B14-5L00-A4-01
      T7EES-085-062-1R00-A52-M0
      T67EDCS-072-B35-014-3R00-A1-01
      T7DDBS-B22-B14-B10-2R00-A1-M0
      T67EDC-085-B24-025-1R00-A1-M1
      T7EDB-050-B24-B14-1R00-A4-M1
      T67EDCS-042-050-012-3R00-A4-M1
      T6CC-014-022-3L00-C500
      T7DDS-B14-B24-1L00-A1-00
      T7DDBS-B22-045-B03-2L00-A1-00
      T6CC-031-014-3L00-C101
      T67DDCS-045-045-025-4L00-A501
      T67EDC-054-B14-028-1L00-A4-M1
      T7EDB-050-B31-B09-1R00-A1-M1
      T6EDCM-045-B45-***-2R00-A1-P0
      T6CCW-020-006-2L00-C501
      T7DDBS-B28-B31-B07-1L00-A5-M0
      T7DDBS-B31-B38-B07-1R00-A5-00
      T6EDM-062-B35-2R00-C4
      T67EDCS-045-050-028-3R00-A4-01
      T67EDC-045-B31-025-1L00-A4-M1
      T6ERY-045-3L00-C40-A1
      T7DDBS-B20-B31-B10-1L00-A1-01
      T6DCW-B20-B05-4L00-B1
      T7DDBS-B17-B28-B14-5L00-A5-M1
      T7EES-072-066-5L00-A13-00
      T6CC-022-010-1L00-C101
      T67DDCS-B38-B31-008-1L00-A5M1
      T7EDBS-045-B28-B10-3R00-A5-00
      T7DDBS-B42-B22-B14-3L00-A1-M0
      T67EDCS-045-045-031-2R00-A5-M0
      T7DDBS-B24-B42-B04-1L00-A5-M1
      T7EDB-085-B38-B09-1L00-A4-M0
      T7DDBS-B28-B42-B12-1R00-A4-00
      T7DBS-B22-B12-2R00-A100
      T67EDCS-052-B31-020-3R00-A5-M1
      T7EDBS-042-B38-B10-3R00-A5-01
      T67DDCS-B31-045-028-1L00-A400
      T7DDBS-B22-B22-B09-4R00-A1-01
      T7DDBS-B42-045-B08-5L00-A5-M1
      T7EDBS-054-B42-B15-3L00-A1-00
      T6DCCM-B45-B08-***-6R00-B4-01
      T67DDCS-B35-B24-005-3L00-A1M1
      T7DDB-B17-B28-B07-5R00-A5-M0
      T7DDBS-B17-B28-B04-3L00-A4-M1
      T67EDCS-085-B35-012-3R00-A5-00
      T7DDBS-B17-B42-B07-2R00-A1-01
      T7DDS-B22-B38-4R00-A5-M0
      T7DBS-B24-B14-4R00-A401
      T7EDBS-057-045-B05-3R00-A5-01
      T67EDC-085-B20-005-1L00-A1-M1
      T7DDBS-050-B42-B15-1R00-A4-01
      T7DDBS-B31-B20-B04-2R00-A1-00
      T7DDBS-B24-B42-B05-2L00-A5-M1
      T7DS-B22-4L00-A100
      T7DDBS-B35-B24-B15-1R00-A4-M1
      T6CRY-025-3R00-040-A1
      T7DDBS-045-B17-B05-1L00-A1-M0
      T67EDCS-066-B38-031-3L00-A4-00
      T6DCC-B50-B20-***-4L00-A4-01
      T6GCC-B12-B20-6L00-B1-M1
      T7EDBS-066-B22-B05-2L00-A1-M0
      T6DCC-B42-B06-***-3R00-A4-M0
      T67EDCS-066-B38-008-2R00-A4-01
      T67EDCS-050-B22-028-2R00-A5-M0
      T7EES-057-057-3L00-A13-00
      T7EDBS-085-045-B08-2L00-A5-01
      T7DDBS-B14-B28-B03-4L00-A4-M1
      T7DDBS-B22-B22-B09-2R00-A1-00
      T7EDBS-050-B38-B02-2L00-A4-M0
      T6ERY-045-3L00-B10-A4
      T7DDB-045-B31-B08-5R00-A4-M1
      T7DDBS-B14-B20-B09-3L00-A4-01
      T7DDBS-B38-B14-B06-3L00-A5-01
      T7EDBS-045-B20-B11-2R00-A5-M0
      T7DBS-B35-B05-2L00-A4M1
      T7DDBS-050-B17-B06-4L00-A1-01
      T7DDBS-B20-050-B08-1L00-A5-01
      T7EES-042-062-3R00-A13-M0
      T67EDC-057-B35-017-1R00-A1-M0
      T67EDC-072-050-005-1L00-A1-M1
      T67EDCS-085-B17-031-3L00-A1-00
      T7DDBS-B17-B38-B14-1R00-A1-M0
      T7EDBS-042-B28-B02-3R00-A5-M0
      T67EC-052-010-3L00-A401
      T7DDBS-B38-B17-B09-5L00-A1-M1
      T6EC-066-B31-1L00-B1
      T67DDCS-B42-045-005-2L00-A5M0
      T67DDCS-045-B31-008-5R00-A500
      T6DCC-B31-B08-***-1R00-A5-00
      T7DDBS-050-B20-B08-1L00-A1-00
      T7EDBS-066-B24-B05-2L00-A1-M1
      T6DCC-B50-B14-***-4R00-A5-M0
      T67DDCS-B35-B14-005-3R00-A500
      T7EDBS-050-B14-B03-2R00-A5-01
      T7EDBS-066-050-B11-3R00-A1-01
      T7DDBS-B17-B24-B15-2L00-A1-00
      T7EDB-066-B20-B03-1R00-A4-M1
      T7DDBS-B20-B31-B12-3L00-A4-M1
      T7EES-066-066-5L00-A10-00
      T7DDBS-B17-045-B12-1L00-A1-01
      T6CCZ-B06-B10-VR00-A-1W0
      T67DDCS-B42-B38-005-2L00-A100
      T67DDCS-B38-045-028-3R00-A1M0
      T6CCZ-B31-B10-VL00-A-110
      T67EDCS-045-B42-003-2R00-A1-M0
      T7DDBS-B17-B31-B09-3L00-A4-00
      T6DR-035-5L00-C40-A1
      T7EDBS-066-B17-B02-3R00-A5-00
      T6D-B45-2R00-B4
      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 T7DDBS-B31-B28-B04-3L00-A1-01
        All was ok! No problems whatsoever.
        Helpful
        Unhelpful

      Parker Denison Vane Pump T7DDBS-B31-B28-B04-3L00-A1-01

      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, YUKEN Vane Pump PV2R3-76-L-RAA-31

      YUKEN Vane Pump PV2R3-76-L-RAA-31

      US$1503.91
      New In stock for sale, OUYIPU Vane Pump PVF-30-35-11S

      OUYIPU Vane Pump PVF-30-35-11S

      US$279.00
      New In stock for sale, KEISTER Vane Pump PV2R2-33-FR

      KEISTER Vane Pump PV2R2-33-FR

      US$620.54
      New In stock for sale, ULVAC Vane Pump PVD-N360-1-750W

      ULVAC Vane Pump PVD-N360-1-750W

      US$1533.33
      New In stock for sale, SMC Proportional Valve ITV1050-312L2

      SMC Proportional Valve ITV1050-312L2

      US$440.69
      New In stock for sale, KOMPASS Check Valve MPW-02B

      KOMPASS Check Valve MPW-02B

      US$96.15
      New In stock for sale, Nachi Overflow Valve SA-G01-C5-C1-31

      Nachi Overflow Valve SA-G01-C5-C1-31

      US$454.62
      New In stock for sale, HPC Piston Pump P08-A1-F-R-01

      HPC Piston Pump P08-A1-F-R-01

      US$1718.08
      New In stock for sale, Boden Gear Pump BKP1B0D1.1T0L3

      Boden Gear Pump BKP1B0D1.1T0L3

      US$457.69

      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 RS40C2E-IAA-302

      Copeland Compressor RS40C2E-IAA-302

      Contact Us
      New In stock for sale, TaeguTec Tool for Metal Cutting SPMG050204-DK TT6030

      TaeguTec Tool for Metal Cutting SPMG050204-DK TT6030

      US$10.77
      New In stock for sale, Copeland Compressor ZP122KCE-TFE-421

      Copeland Compressor ZP122KCE-TFE-421

      Contact Us
      New In stock for sale, Sanyo Denki Fan 109L0648G4D01

      Sanyo Denki Fan 109L0648G4D01

      US$45.45
      New In stock for sale, Panasonic Relay TQ2-L2-3V

      Panasonic Relay TQ2-L2-3V

      US$2.31
      New In stock for sale, Bristol Compressor H92G124DBVR

      Bristol Compressor H92G124DBVR

      Contact Us
      New In stock for sale, Eaton Contactor C80FN421B02

      Eaton Contactor C80FN421B02

      Contact Us
      New In stock for sale, Panasonic Air Conditioner CS-HC45FY02

      Panasonic Air Conditioner CS-HC45FY02

      US$3691.54
      New In stock for sale, Copeland Compressor 6MMS1-30X-EWM/D-P

      Copeland Compressor 6MMS1-30X-EWM/D-P

      Contact Us
      New In stock for sale, Ebmpapst Fan 5560005021

      Ebmpapst Fan 5560005021

      Contact Us

      Recent related posts

      The evolution history of air compressors

      09/08/2020

      The evolution history of air compressors

      The (mechanical) vacuum pump made in Germany in 1640 is the originator of modern air compressors.    Around 1800, the first single-stage (reciprocating piston) air compressor was made in the UK, and its discharge pressure was 1.38MPa (gauge pressure).

      Do you know how air conditioning works

      07/01/2020

      Do you know how air conditioning works

      Do you know how air conditioning works There are many air conditioners, but I believe many people don’t know how it works. Let’s introduce to you the staff of okmarts.com. The basic working principle of air conditioners! The basic principle of Taikang compressor    air conditioner is this, which can be divided into the following processes:

      Common problems and solutions of industrial chillers summarized by the maintenance master

      08/21/2020

      Common problems and solutions of industrial chillers summarized by the maintenance master

      1. Water leakage (first determine the location of the water leakage)    1. The pump leaks (causes: the shaft seal at the water pump is not well connected or the shaft seal has been damaged)

      Danfoss and Abena donate more than one million yuan of protective materials to support Chinese fight against New Coronary Pneumonia

      06/14/2020

      Danfoss and Abena donate more than one million yuan of protective materials to support Chinese fight against New Coronary Pneumonia

      Danfoss and Abena donate more than one million yuan of protective materials to support China's fight against New Coronary Pneumonia On 2020.2.8, a batch of much-needed protective materials donated by Danfoss and Abena, a world-renowned health care produc器2䀀ᅵ皥䖒皦즠Ʋ煔क़㲈Ʋ䌁皦ᮔDž༬皧煞क़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즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔDž'鱤džၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧ڦ識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴 識杴 㥲ᐲ

      Precautions when the FRP cooling tower is assembled and ready for operation

      08/20/2020

      Precautions when the FRP cooling tower is assembled and ready for operation

      When the FRP cooling tower is assembled and ready for normal operation, the following necessary inspections should be done first:

      Introduction to cleaning and maintenance of temperature control valve of okmarts.com air compressor

      09/11/2020

      Introduction to cleaning and maintenance of temperature control valve of okmarts.com air compressor

      The composition of the temperature control valve of okmarts.com air compressor: The temperature control valve is composed of valve body, valve core, temperature sensing element, spring, etc.:

      Top 13 Servo Motor Manufacturers Worldwide in 2024

      03/10/2025

      Top 13 Servo Motor Manufacturers Worldwide in 2024

      There are many brands of servo motors on the market. How can you choose a cost-effective brand with good quality among the many brands?

      How to Choose A Water Pump

      07/26/2022

      How to Choose A Water Pump

      The flow of the water pump, that is, the water output, generally should not be too large, otherwise it will increase the cost of purchasing the water pump.

      These 23 air conditioning application tips you should know

      08/17/2020

      These 23 air conditioning application tips you should know

      Air-conditioning is an indispensable part of the home, especially in the hot summer, it is simply a magic weapon to get rid of the heat. In some areas, there is no heating in winter, or on the eve of heating between autumn and winter, many families also u碌7館2䀀締眪湠眷VV

      Detailed explanation of multi-line air conditioning installation 3 times 5 key 8 steps specification

      08/08/2020

      Detailed explanation of multi-line air conditioning installation 3 times 5 key 8 steps specification

      Detailed explanation of multi-line air conditioning installation 3 times 5 key 8 steps specification It’s not an exaggeration to say that the central air conditioner is installed with 3 points and 7 points for quality.

      • 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 :

      Eaton Vickers Vane Pump Rexroth Vane Pump ANSON Vane Pump OUYIPU Vane Pump TCMC Vane Pump Daikin Vane Pump Furnan Vane Pump Parker Denison Vane Pump DIFU Vane Pump Kompass Vane Pump VZ80A4RX-10 V20-1S7S-1C11 VQ15-26-FR VPE-F30C-9T VQ15-19-F-RAL-01 25CJT0752 MHMF022L1V2M VE4025B1045 8E5K-22-X VA08H-760 AGA5568EXN ARK KVF3130-DC24V Bristol H29B33UDBLA caj4476y Goetze TUV-SV.19-2055.11D/G.0.8 H23A383DBL Hitachi BSA357DT-T1AA hrp 300 5 IMI Norgren 2636000.4220.024.00 Kulthorn AE2428ZK-SR MARTO FAN mf60151v3 mhmd082g1u Moog Servo Valve G772K620 Nidec U30X M Z5 rsp 1500 12 sc 4 1 contactor SMC SQ1241D-5L01-L6-B-X91 SUNON EG50040S1-CD50-S9A YUTIEN RVGS-06-3

      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