Milwaukee Valve 508-38 Bronze Check Valve 3/8 Inch Npt

Product Description

The MILWAUKEE VALVE 508-38 is a bronze swing check valve with threaded NPT end connections, designed to allow one-directional flow and prevent backflow in piping systems handling gas, oil, or water. Rated at 400 WOG (Water-Oil-Gas), it carries a crack pressure of 0.50 psi and a maximum operating temperature of 550 degrees F, making it suitable for a wide range of commercial and industrial service conditions. The body and seat are both bronze, meeting ASTM B61 material standards and conforming to MSS SP-80. Licensed plumbers and pipefitters are the primary installers of this type of valve in hydronic, fuel, and utility piping systems.

This check valve is sized for 3/8 inch pipe and is well suited for residential and light commercial plumbing, HVAC hydronic loops, gas distribution lines, and oil supply piping. Its threaded NPT connections make it compatible with standard pipe and fitting systems without the need for specialized tooling. The operating temperature range of -20 degrees F to 550 degrees F covers most conventional service environments where backflow prevention is required at low crack pressure.

Key Features

• 400 WOG pressure rating for use with water, oil, and gas service
• Low crack pressure of 0.50 psi allows the valve to open under minimal differential pressure
• Bronze body and seal construction rated to ASTM B61 material grade
• Threaded NPT end connections for straightforward installation into standard pipe systems
• Conforms to MSS SP-80 industry standards for bronze valves
• Wide temperature range: -20 degrees F to 550 degrees F

Compatibility

Rated for use with gas, oil, and water piping systems. Designed as an OEM-style replacement or new-installation check valve for 3/8 inch NPT threaded piping applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local plumbing codes and IFGC requirements where gas service is involved. Shut off and depressurize the line completely before removing or installing any check valve. Verify correct flow direction before threading the valve into place, as check valves are directional and will not function properly if installed backwards. Use appropriate thread sealant rated for the service fluid — confirm compatibility with gas or oil service before application.