Specialty Mfr 6431490 Inline Check Valve 1/4 in Mnpt Brass

Product Description

The SPECIALTY MFR 6431490 is a 1/4-inch inline check valve designed to allow one-directional fluid flow and prevent backflow in plumbing, HVAC, and light industrial piping systems. The body and piston are machined from brass for corrosion resistance and durability under pressure cycling. The Viton seal provides reliable performance across a wide temperature range and resists degradation from oils, fuels, and refrigerants. Both end connections are MNPT, making field installation straightforward with standard threaded pipe fittings. This valve is a working component installed by licensed plumbers and HVAC technicians in systems where backflow prevention is required.

The 6431490 inline check valve is suited for residential and light commercial applications where a compact 1/4-inch threaded check valve is needed. Common install scenarios include refrigeration line sets, compressed air systems, hydronic heating circuits, and plumbing supply lines where reverse flow would damage equipment or compromise system integrity. The MNPT x MNPT configuration connects directly to external pipe threads on both inlet and outlet sides without adapters.

Key Features

• Brass body and brass piston construction for corrosion resistance and long service life
• Viton seal material compatible with refrigerants, oils, and fuels
• 1/4-inch pipe size with MNPT x MNPT end connections on both sides
• Inline valve orientation for straightforward inline pipe installation
• Compact form factor suitable for tight plumbing spaces

Compatibility

Designed as an OEM-style inline check valve replacement for 1/4-inch MNPT threaded piping systems in residential and light commercial plumbing, HVAC, and refrigeration applications.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician. Shut off system pressure and depressurize the line completely before removing or installing any check valve. Apply thread sealant tape to MNPT threads per IPC and IFGC guidelines to prevent leaks. Verify flow direction arrow or inlet marking on the valve body before tightening to avoid reverse installation.