{"product_id":"mueller-streamline-a15503-400-pressure-relief-valve-400-psi","title":"Mueller Streamline a15503-400 Pressure Relief Valve 400 Psi","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe MUELLER STREAMLINE a15503-400 is a straight-through pressure relief valve designed to protect pressurized fluid systems from overpressure conditions. Set at 400 psi, it opens when line pressure reaches the preset threshold and reseats when pressure returns to a safe level. The brass body provides corrosion resistance in potable water and refrigerant-adjacent applications. At 0.35 pounds and 3 inches wide, this is a compact inline safety device. It is installed by licensed plumbers and HVAC technicians as a code-required safeguard in compressed-fluid lines, refrigeration circuits, and related pressure systems.\u003c\/p\u003e\u003cp\u003eThis valve is suited for residential and light commercial installations where a 3\/8 x 1\/2 inch NPTFE x flared connection is required. The NPTFE inlet threads to pipe fittings or manifold ports, while the flared outlet connects to standard tubing. Its operating pressure range of 150 to 700 psi and temperature rating of -40 to 300 degrees F make it compatible with a range of fluid and refrigerant service conditions. Plumbers and refrigeration technicians install this valve on pressurized lines requiring a dedicated relief path.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e400 psi factory pressure setting — opens on overpressure, reseats automatically\u003c\/li\u003e\n\u003cli\u003eOperating pressure range: 150 to 700 psi\u003c\/li\u003e\n\u003cli\u003eTemperature rated from -40 to 300 degrees F\u003c\/li\u003e\n\u003cli\u003eBrass body construction for corrosion resistance\u003c\/li\u003e\n\u003cli\u003e3\/8 x 1\/2 inch NPTFE x flared end configuration for direct inline installation\u003c\/li\u003e\n\u003cli\u003eCompact 3-inch width and 0.35-pound weight for tight spaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation straight-through pressure relief valve for pressurized plumbing and refrigeration lines requiring a 3\/8 x 1\/2 inch NPTFE x flared connection.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation must be performed by a licensed plumber or HVAC-refrigeration technician in accordance with applicable local codes and ASME or ASHRAE standards. Depressurize and isolate the system completely before removing or installing any pressure relief device. The relief outlet must be piped to a safe discharge location per code — never capped or plugged. Verify the valve pressure setting matches the rated working pressure of the system before installation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Setting\u003c\/strong\u003e: 400 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 150 to 700 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating\u003c\/strong\u003e: -40 to 300 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Type\u003c\/strong\u003e: NPTFE x Flared\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Size\u003c\/strong\u003e: 3\/8 x 1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Material\u003c\/strong\u003e: Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.35 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: MUELLER STREAMLINE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: a15503-400\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MUELLER STREAMLINE","offers":[{"title":"Default Title","offer_id":51138637562162,"sku":"A15503-400","price":64.58,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/305531181.jpg?v=1778260863","url":"https:\/\/voomisupply.com\/products\/mueller-streamline-a15503-400-pressure-relief-valve-400-psi","provider":"Voomi Supply","version":"1.0","type":"link"}