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Small stainless steel inline swing check valve with threaded ends

Zoro Select

Zoro Select 4VMT8 3/8" NPT Stainless Steel Swing Check Valve .5 psi 200 psi 316 SS 350°F 5.1 gpm

SKU CH-3KAA-V57NB

Stops back-flow in 3/8 in FNPT lines with a .5 psi cracking pressure, 316 stainless body, PTFE seal, 200 psi rating, 350 °F limit and 5.1 gpm flow

  • Prevents backflow with .5 psi cracking pressure
  • Handles 200 psi water and steam pressure
  • 316 stainless steel body resists corrosion
  • Operates from -4°F to 350°F temperature range
  • Delivers 5.1 gpm full-flow capacity

Zoro Select 3/8" NPT Check Valve

The Zoro Select 4VMT8 is an inline swing check valve made from 316 stainless steel. It uses FNPT x FNPT connections and a PTFE seal. The cracking pressure is .5 psi with a maximum water pressure of 200 psi. It operates from -4 to 350 degrees F and delivers a flow of 5.1 gpm.

Suited for horizontal piping needing backflow

This valve fits horizontal pipe runs where a simple swing mechanism is preferred. It is not for buyers who need vertical mounting orientation or a different cracking pressure. It also does not suit systems requiring a spring-assisted or lift-check design.

Verify pipe size and thread compatibility

Confirm your piping uses 3/8 inch NPT female threads before ordering. Check that the system pressure stays within the 200 psi limit and that the temperature range matches the -4 to 350 degrees F rating. Ensure the PTFE seal material is compatible with the intended fluid.

Highlights

  • Prevents backflow with .5 psi cracking pressure
  • Handles 200 psi water and steam pressure
  • 316 stainless steel body resists corrosion
  • Operates from -4°F to 350°F temperature range
  • Delivers 5.1 gpm full-flow capacity

Specifications

BrandZORO SELECT

Questions about this item

What pipe size and thread type must my existing plumbing have to connect this 3/8" NPT swing check valve?

Your piping needs a 3/8 inch nominal bore with male NPT threads on both ends to mate with the valve's FNPT x FNPT connections.

Will the 0.5 psi cracking pressure and 200 psi rating work reliably with my older low-pressure pump system?

The valve opens at just 0.5 psi and handles up to 200 psi, so it suits low-pressure pumps while providing ample margin for pressure spikes in legacy systems.

How can I verify the 316 stainless body and PTFE seal are functioning correctly after installation?

Check for zero backflow when the pump stops, confirm forward flow reaches 5.1 gpm, and ensure no leakage occurs at temperatures up to 350 °F.

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