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 T7EDB-057-B28-B04-1R00-A4-M0
      1/1
      Parker Denison Vane Pump T7EDB-057-B28-B04-1R00-A4-M0

      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-050-050-008-3L00-A101
      T7DBS-B17-B02-2R00-A1M0
      T7DDBS-B20-B42-B14-4R00-A4-M1
      T6DRY-050-3R00-B10-A5
      T67EDCS-062-B28-014-3L00-A1-M0
      T7DDBS-B28-B35-B09-3R00-A4-00
      T7DDBS-B22-B22-B04-4R00-A5-M1
      T7DDBS-B42-B17-B08-5R00-A1-M1
      T7DDBS-B38-B14-B15-5L00-A4-00
      T7EBS-052-B10-4L00-A5M1
      T6DCCM-B20-B17-***-3L00-B4-00
      T7DDBS-050-050-B07-1R00-A4-M0
      T7EDS-057-B22-2L00-A4-00
      T67DDCS-B42-B17-005-1R00-A500
      T7DDBS-B20-050-B02-4R00-A5-01
      T7EDS-062-B35-3R00-A1-M0
      T7DDBS-B17-B31-B06-1L00-A5-M0
      T7DDBS-045-B38-B06-4L00-A5-M1
      T6ER-052-4R00-C10-A5
      T7DDBS-B14-B24-B06-5R00-A1-M1
      T7EDBS-066-050-B08-2L00-A1-01
      T7DDBS-B22-B28-B07-4R00-A4-01
      T67EC-057-012-4R00-A5M0
      T67EDCS-066-B38-020-3R00-A4-M1
      T7DDBS-B35-B22-B03-4L00-A5-M0
      T6CR-017-3R00-B30-A5
      T67DDCS-B42-B28-022-5R00-A500
      T7EDBS-050-B14-B03-3R00-A1-M1
      T67EDCS-062-B35-003-3R00-A1-01
      T6DCCM-B17-B25-***-4L00-B4-01
      T67DDCS-B38-B42-031-5L00-A1M0
      T7DBS-B31-B05-3R00-A100
      T7DDBS-B28-B42-B04-4L00-A4-01
      T7EDBS-057-B14-B07-3L00-A1-M1
      T7DDBS-B20-B22-B03-1R00-A5-M0
      T7EBS-062-B15-5L00-A4M1
      T7DDBS-B24-B14-B03-4L00-A5-M1
      T7EDBS-085-B38-B07-2L00-A4-M0
      T6EDM-072-B42-3L00-C5
      T6CCP-B31-***-4R00-D1-10
      T7DDB-B35-B28-B14-5L00-A1-M0
      T6CC-020-012-3L00-C501
      T7DDBS-B22-B35-B09-5L00-A4-01
      T7DDBS-B31-B38-B02-3L00-A5-00
      T67EDCS-042-B17-028-3R00-A5-01
      T6ER-050-3L00-B50-A5
      T6DCCM-B35-B22-***-1R00-B5-01
      T7EDBS-062-050-B04-3R00-A5-M1
      T67EDCS-066-B38-012-3L00-A5-M0
      T6DCW-B28-B08-1L00-B5
      T7DBS-B38-B14-4R00-A1M0
      T7DBS-B20-B02-5L00-A400
      T7DDBS-B17-B31-B02-3R00-A1-01
      T6EC-052-B06-2R00-B5
      T7DDBS-045-B31-B02-1L00-A5-01
      T7DDBS-050-B31-B02-3L00-A4-M0
      T67DDCS-045-050-017-3R00-A1M0
      T6DRY-028-1R00-A30-A5
      T7DDBS-B42-B17-B06-2R00-A1-00
      T7DDBS-B17-B42-B12-4R00-A1-M0
      T6EDCR-066-038-***-1L00-A5P0
      T67EC-054-012-2R00-A4M0
      T7DDBS-B42-B17-B15-4R00-A5-00
      T7EDBS-050-050-B02-3L00-A1-00
      T67EDCS-045-B31-006-3R00-A5-01
      T7EDBS-062-B35-B02-2L00-A4-00
      T7EDBS-054-B28-B07-2R00-A4-M1
      T7DDBS-B31-B31-B14-3L00-A5-M1
      T67DDCS-050-B31-008-1R00-A4M0
      T67EDCS-085-B28-003-3R00-A5-M1
      T67DDCS-045-045-008-2R00-A1M0
      T7DD-B35-045-5R00-A5-M0
      T67DDCS-B38-B38-028-2L00-A401
      T7EDBS-085-B22-B07-2L00-A5-M1
      T7DDBS-B35-B31-B07-3L00-A4-M0
      T7DDBS-050-B31-B12-1L00-A1-M0
      T7EES-062-066-2R00-A50-M0
      T6EDC-045-B28-***-1R00-A4-P1
      T7DDBS-B24-B28-B12-3R00-A4-00
      T67EDCS-054-B28-012-2R00-A5-01
      T6DR-050-3L00-A50-A5
      T67DDCS-B35-B28-005-3L00-A1M0
      T7DDB-B31-B31-B12-5L00-A5-M1
      T67EDCS-045-B24-025-2R00-A5-00
      T7EDBS-062-B24-B08-3R00-A1-M1
      T7DDBS-B38-050-B11-2L00-A5-00
      T7DDB-050-B35-B02-5L00-A4-M0
      T7DD-B35-B28-5L00-A1-M0
      T7DS-B14-1R00-A4Y0
      T6DCCM-B35-B25-***-3R00-B4-M1
      T6CR-025-3R00-A50-A4
      T67DDCS-B42-B31-008-1L00-A1M1
      T67DDCS-B35-B31-017-4R00-A1M1
      T7EDBS-050-B14-B08-3L00-A5-M0
      T7DDBS-B38-B35-B15-4R00-A4-M1
      T7DDBS-B14-B42-B12-1R00-A1-M0
      T7DDBS-B31-B24-B07-1R00-A1-M1
      T67DDCS-B38-B35-006-2L00-A5M1
      T67DDCS-B42-B28-017-5R00-A1M0
      T7DDBS-B28-B42-B07-3L00-A4-M0
      T7DBS-B14-B05-4L00-A400
      T7DDBS-B42-B42-B14-1R00-A1-M1
      T67EDCS-066-B20-025-3L00-A4-M0
      T7DBS-B35-B09-3R00-A1M1
      T7DDBS-B22-B35-B12-3R00-A4-M0
      T7DDBS-045-050-B05-5R00-A1-M0
      T7DDBS-B31-B42-B12-4L00-A4-00
      T7BBS-B02-B15-4L00-A401
      T6ER-066-1L00-C20-A1
      T7BBS-B05-B11-1L00-A400
      T6DRY-038-2R00-020-A4
      T7EDS-085-050-5R00-A1-00
      T67EC-050-022-1L00-A100
      T67DDCS-B35-B14-014-2R00-A501
      T67EDCS-057-B14-020-2R00-A1-01
      T7DDBS-B35-B28-B06-1R00-A1-01
      T6CR-017-3R00-C10-A1
      T67EDCS-045-B17-012-3R00-A5-M1
      T67EDCS-050-B42-028-2L00-A5-00
      T7DDBS-B42-B35-B09-3L00-A4-00
      T67EDC-085-B35-014-1R00-A5-M0
      T67EDCS-050-B22-025-3R00-A1-M1
      T7EDS-052-045-4R00-A1-00
      T7EDBS-052-045-B12-3R00-A4-M1
      T67DDCS-B42-B38-006-4R00-A400
      T67DDCS-045-B22-022-1R00-A101
      T7EDBS-054-B24-B15-2L00-A4-00
      T7DDS-B42-B14-5R00-A1-M0
      T6ERY-072-1R00-C16/320-A1
      T7DDBS-B42-B22-B05-4R00-A4-00
      T7EDS-050-050-2R00-A4-M0
      T7BBS-B06-B04-3L00-A1M1
      T67EDCS-045-B20-005-2R00-A5-M1
      T7EBS-085-B02-3L00-A401
      T67EDCS-050-B22-010-2L00-A5-01
      T7EDBS-066-B31-B11-3L00-A4-M0
      T67DDCS-050-B38-017-2R00-A400
      T7DDBS-B28-B20-B11-3R00-A5-00
      T6DR-020-1L00-040-A1
      T67EDCS-042-B38-020-3L00-A5-M1
      T6CRY-020-4L00-B10-A1
      T67DDCS-B38-B38-022-5L00-A5M0
      T67DDCS-B42-B14-005-1R00-A101
      T7DDBS-B35-050-B12-4R00-A5-M0
      T7DDBS-B38-B38-B11-1R00-A4-M0
      T6DCC-B28-B08-***-2R00-A1-M1
      T7DDBS-045-B28-B07-3L00-A4-01
      T67EC-050-022-4R00-A4M0
      T7EDBS-045-B17-B03-2L00-A5-M1
      T67DDCS-050-B14-028-3L00-A1M1
      T7DDBS-B42-B22-B07-2R00-A5-M0
      T7DDBS-B38-B42-B15-3L00-A4-M1
      T7DDBS-050-B31-B15-1R00-A5-00
      T67EDCS-050-B28-025-3R00-A5-01
      T67EDCS-066-045-031-2L00-A4-01
      T7DDBS-045-B20-B12-4L00-A1-00
      T7DDBS-B35-B38-B04-3R00-A1-00
      T7DDBS-B35-B17-B08-3R00-A4-00
      T7DDBS-050-045-B02-3L00-A4-01
      T67EDC-062-B31-022-1L00-A1-M0
      T7DDB-B38-B20-B06-5R00-A4-M0
      T7EDBS-072-B20-B08-2L00-A5-00
      T6CR-008-1L00-016/320-A1
      T7EES-054-057-5L00-A40-M0
      T7EES-045-042-4R00-A52-00
      T67DDCS-B35-B38-003-4L00-A1M0
      T7EDBS-085-B24-B02-2L00-A1-M1
      T6DCCM-B24-B31-***-4L00-B1-M0
      T7DDBS-B17-045-B02-4R00-A5-00
      T7EDBS-085-B35-B11-3L00-A5-M1
      T7EES-085-052-3R00-A40-M0
      T67DDCS-B35-B28-010-5L00-A4M0
      T67DDCS-050-B24-012-5R00-A5M1
      T7DDB-B22-B31-B15-5L00-A1-M1
      T7EES-045-072-1L00-A13-M0
      T67EDC-045-B31-014-1R00-A5-M0
      T7EDBS-066-B24-B02-2R00-A5-M0
      T7DDB-B28-050-B08-5R00-A5-M1
      T7EDBS-072-B17-B04-2R00-A1-M1
      T67DDCS-045-B17-014-5R00-A101
      T6CM-B25-1P00-C4
      T7DB-B42-B06-5L00-A4M1
      T67EDCS-062-050-012-2R00-A4-00
      T67EDC-045-B20-008-1R00-A4-M0
      T6DRY-014-3L00-A40-A4
      T7DDS-B31-B31-5R00-A5-00
      T7EDBS-052-B14-B03-3R00-A4-M1
      T6CR-012-5L00-C40-A1
      T7EDBS-062-B20-B15-3L00-A1-01
      T7EDBS-050-B31-B14-3L00-A4-M0
      T7EES-066-050-4R00-A40-M0
      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 T7EDB-057-B28-B04-1R00-A4-M0
        All was ok! No problems whatsoever.
        Helpful
        Unhelpful

      Parker Denison Vane Pump T7EDB-057-B28-B04-1R00-A4-M0

      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, KEISTER Vane Pump PV2R2-33-FR

      KEISTER Vane Pump PV2R2-33-FR

      US$620.54
      New In stock for sale, Furnan Vane Pump 50T-36-FR-1

      Furnan Vane Pump 50T-36-FR-1

      US$331.00
      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, 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, SMC Proportional Valve ITV2031-31N2L4

      SMC Proportional Valve ITV2031-31N2L4

      US$518.26
      New In stock for sale, ASHUN Check Valve TCV-06G

      ASHUN Check Valve TCV-06G

      US$384.23
      New In stock for sale, HP Overflow Valve MRF-04C-K-3-20

      HP Overflow Valve MRF-04C-K-3-20

      US$230.77
      New In stock for sale, NACHI Piston Pump PVS-2B-45N3-UZ-12

      NACHI Piston Pump PVS-2B-45N3-UZ-12

      US$1346.15
      New In stock for sale, DEKA Gear Pump ALPA2-S-9+ALPP2-S-9

      DEKA Gear Pump ALPA2-S-9+ALPP2-S-9

      US$1076.92

      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, EALY Vane Pump PV2R12-31-59FREAA-40

      EALY Vane Pump PV2R12-31-59FREAA-40

      US$1730.77
      New In stock for sale, COSEL Power Supply CBS2004824-F5

      COSEL Power Supply CBS2004824-F5

      US$534.65
      New In stock for sale, CKD Ball Valve MXB1-50-W-3

      CKD Ball Valve MXB1-50-W-3

      US$884.62
      New In stock for sale, Mean Well Power Supply HRP-150-12

      Mean Well Power Supply HRP-150-12

      US$107.54
      New In stock for sale, Danfoss Compressor HRP045T9LP6

      Danfoss Compressor HRP045T9LP6

      Contact Us
      New In stock for sale, Emerson Alco Expansion Valve 066986

      Emerson Alco Expansion Valve 066986

      Contact Us
      New In stock for sale, Tecumseh Compressor VTCX419U

      Tecumseh Compressor VTCX419U

      Contact Us
      New In stock for sale, BANDO Belt T10-1080-24

      BANDO Belt T10-1080-24

      US$50.00
      New In stock for sale, Duelund Resistor VSF 6R8 ±5% 10W

      Duelund Resistor VSF 6R8 ±5% 10W

      US$69.23
      New In stock for sale, Euchner Relay ESM-BA301P

      Euchner Relay ESM-BA301P

      US$562.50

      Recent related posts

      What is A Solenoid Coil?

      06/07/2022

      What is A Solenoid Coil?

      The solenoid coil generally refers to the inductive coil, which is wound on the insulating tube by the wires. The wires are insulated from each other.

      Industrial refrigeration screw refrigeration compressor repair

      06/14/2020

      Industrial refrigeration screw refrigeration compressor repair

      Industrial refrigeration screw refrigeration compressor maintenance, screw refrigeration compressor has the following advantages:

      Refrigerator Buying Guide: How to Choose a Refrigerator (Part 2)

      08/23/2024

      Refrigerator Buying Guide: How to Choose a Refrigerator (Part 2)

      Freezing capacity is the weight of food frozen to -18℃ in 12 hours by a refrigerator. The stronger the freezing capacity, the faster it can lock the freshness and moisture of the ingredients through ice crystals.

      The air conditioner does not use electricity, the minimum cooling is -25 ℃, is it true

      06/14/2020

      The air conditioner does not use electricity, the minimum cooling is -25 ℃, is it true

      The air conditioner does not use electricity, the minimum cooling is -25 ℃, is it true Air-conditioning has become an indispensable configuration for everyone.

      Refrigeration compressor industry market competition status and development trend research report

      06/14/2020

      Refrigeration compressor industry market competition status and development trend research report

      In recent years, China's refrigeration compressor industry has also developed rapidly due to downstream demand. During the "Eleventh Five-Year Plan" period, the localization rate of complete sets of refrigeration compressors in all major fields of industrﰸ2䀀ᅵ皥䖒皦즠Ʋ娼ི㲈Ʋ䌁皦隆ᮔDž༬皧婆ིЀ呄ᠾ鹨់༹皧ࠄ00븹먱댁珵理뛐珵Љ䕄ྦ￿￿뤂ᐱ變뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់變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

      Introducing the performance characteristics of Meiyou Le Maneurop compressor MTZ144

      07/04/2020

      Introducing the performance characteristics of Meiyou Le Maneurop compressor MTZ144

      Introducing the performance characteristics of Meiyou Le Maneurop compressor MTZ144 Pictured here: the United States US Youle MANEUROP compressor MTZ144 Product features of MTZ144: 1. The design plan of the US Youle compressor is environmentally friendly, and the series compressors can run smoothly and reliably.

      The Era of Intelligent Building Management Comes with Siemens HMI + KNX

      11/07/2021

      The Era of Intelligent Building Management Comes with Siemens HMI + KNX

      Siemens is a leading electronic and automation product manufacturer in the world. Based on its advanced human-computer communication technology and brand development concept

      Reasons for uneven liquid distribution in refrigeration systems and tragic cases!

      07/31/2020

      Reasons for uneven liquid distribution in refrigeration systems and tragic cases!

      If the distribution head is not evenly distributed, it will cause too much refrigerant in some of the bypasses and frost the evaporator.

      Structure diagram of single vane compressor_Main features of single vane compressor

      06/20/2020

      Structure diagram of single vane compressor_Main features of single vane compressor

         The basic structure and working principle of single slide compressor.<img src="{{media url=&quot;Structure_diagram_of_single_vane_compressor_Main_features_of_single_vane_compressor.jpg&quot;}}" alt="" /> Single sliding vane compressor is also called scraper compressor or rolling rotor compressor. Its structure is shown in Figure 3-7. A cylindrical eccentric rotor (also called a piston) is installed in the cylinder, and the center of rotation of the rotor coincides with the center of the cylinder. In the middle of the upper part of the cylinder, a scraper that can slide up and down is installed. Due to the force of the spring,<img src="{{media url=&quot;Structure_diagram_of_single_vane_compressor_Main_features_of_single_vane_compressor2.jpg&quot;}}" alt="" />

      Radiator Fan Replacement Cost: Factors to Consider

      11/08/2023

      Radiator Fan Replacement Cost: Factors to Consider

      The radiator fan plays a crucial role in maintaining optimal engine temperature by assisting in heat dissipation. However, like any automotive component, it can fail over time due to wear and tear or other issues.

      • 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 :

      JANUS Vane Pump EALY Vane Pump Furnan Vane Pump NACHI Vane Pump YUKEN Vane Pump Kompass Vane Pump OUYIPU Vane Pump ANSON Vane Pump Berarma Vane Pump DIFU Vane Pump VPE-F30C-9T VQ15-19-F-RAL-01 VDC-1B-2A3-HU-1688K PVDF-470-470-10S PV2R12-19-65-L-REAA-41 25CJT0752 MHMF022L1V2M VE4025B1045 8E5K-22-X VA08H-760 AGT201B827HD AVC BAZA1022R2U CKD FS2-03-4-AC220V DV5218/2NPR Ebmpapst R3G190-RB01-08 encoder autonics e40s6 1000 3 t 24 GTD5160NH40K H73A463DBEA IKURA UP12B20 IMI Norgren 8498319.8176.024.00 kde0504pfv2 LG QP425P M34313 16 MSM022J1SX NDJ33YEA PNEUMAX 2435.52.00.39.88 SUMMER DB10-1-30-31.5 TIDAR 200×200×60 Toshiba KSK103D33UEZ3 VTOZ WDR-10P

      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