{"product_id":"ay-mcdonald-4423-378-pex-a-poly-insert-coupling","title":"Ay Mcdonald 4423-378 Pex-a Poly Insert Coupling","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe AY MCDONALD 4423-378 is a reducing poly insert coupling designed to connect 1-inch PEX-A tubing to 3\/4-inch PEX-A tubing in potable water and hydronic piping systems. The insert-style fitting slides into the PEX tubing bore and is secured with a crimp ring or clamp ring, creating a leak-resistant mechanical joint without soldering or threading. This type of fitting is installed by licensed plumbers and pipefitters during new construction, remodel, or repair work wherever a reduction in line size is required. The poly body resists corrosion and scale, making it well suited for residential and light-commercial plumbing applications.\u003c\/p\u003e\n\u003cp\u003eThis coupling is used in PEX-A radiant heat systems, domestic hot and cold water distribution, and manifold-fed home-run plumbing layouts. Its reducing geometry allows a plumber to step down from a 1-inch main or sub-main to a 3\/4-inch branch line without adding a separate bushing or adapter. It is appropriate for concealed installations in walls, floors, and ceilings where access after completion is limited, so a reliable connection is essential on the first install.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eReducing insert design connects 1-inch PEX-A to 3\/4-inch PEX-A in a single fitting\u003c\/li\u003e\n  \u003cli\u003ePoly body construction resists corrosion, scale buildup, and chemical degradation\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard crimp-ring and clamp-ring installation tools\u003c\/li\u003e\n  \u003cli\u003eNo soldering, threading, or open flame required for installation\u003c\/li\u003e\n  \u003cli\u003eSuited for potable water and hydronic closed-loop applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style insert fitting for use with 1-inch by 3\/4-inch PEX-A tubing in residential and light-commercial plumbing and hydronic systems.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by a licensed plumber in accordance with local plumbing codes and the IPC. Shut off the water supply and depressurize the line before cutting and fitting. Use a go\/no-go gauge after crimping or clamping to verify the connection meets manufacturer and code requirements. Do not reuse a fitting that has been seated and crimped.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInlet Size\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutlet Size\u003c\/strong\u003e: 3\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Type\u003c\/strong\u003e: Reducing Insert Coupling\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTubing Compatibility\u003c\/strong\u003e: PEX-A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Material\u003c\/strong\u003e: Poly\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC\u003c\/strong\u003e: 813927019789\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: AY MCDONALD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 4423-378\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AY MCDONALD","offers":[{"title":"Default Title","offer_id":51396357390642,"sku":"4423-378","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/312834276.jpg?v=1782830072","url":"https:\/\/voomisupply.com\/products\/ay-mcdonald-4423-378-pex-a-poly-insert-coupling","provider":"Voomi Supply","version":"1.0","type":"link"}