{"product_id":"specialty-mfr-6431490-inline-check-valve-1-4-in-mnpt-brass","title":"Specialty Mfr 6431490 Inline Check Valve 1\/4 in Mnpt Brass","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBrass body and brass piston construction for corrosion resistance and long service life\u003c\/li\u003e\n  \u003cli\u003eViton seal material compatible with refrigerants, oils, and fuels\u003c\/li\u003e\n  \u003cli\u003e1\/4-inch pipe size with MNPT x MNPT end connections on both sides\u003c\/li\u003e\n  \u003cli\u003eInline valve orientation for straightforward inline pipe installation\u003c\/li\u003e\n  \u003cli\u003eCompact form factor suitable for tight plumbing spaces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned 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.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation 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.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValve Type\u003c\/strong\u003e: Inline Check Valve\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePipe Size\u003c\/strong\u003e: 1\/4 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Type\u003c\/strong\u003e: MNPT x MNPT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Material\u003c\/strong\u003e: Brass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePiston Material\u003c\/strong\u003e: Brass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeal Material\u003c\/strong\u003e: Viton\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 13 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SPECIALTY MFR\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 6431490\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPECIALTY MFR","offers":[{"title":"Default Title","offer_id":67911629701426,"sku":"6431490","price":53.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/1b4a41abdd313ec5dbd9d98ce7c83d64.jpg?v=1791214664","url":"https:\/\/voomisupply.com\/products\/specialty-mfr-6431490-inline-check-valve-1-4-in-mnpt-brass","provider":"Voomi Supply","version":"1.0","type":"link"}