{"product_id":"proline-bk-products-4-in-hub-sizes-x-4-in-d-hub-sizes-neoprene-stainless-steel-no-hub-coupling-1-p","title":"ProLine BK Products 4 in. Hub Sizes X 4 in. D Hub Sizes Neoprene\/Stainless Steel No Hub Coupling 1 p","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eProLine BK Products 4 in. No Hub Coupling\u003c\/strong\u003e is a dependable, lead-free solution for joining 4-inch hub-to-hub piping without a hub. Crafted with a resilient neoprene interior and a durable stainless steel exterior, this coupling delivers a secure seal that stands up to everyday plumbing challenges—from routine repairs to retrofit upgrades in drain-waste-vent (DWV) systems.\u003c\/p\u003e \u003cp\u003eWhy professionals choose this No Hub Coupling:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eLead-Free construction\u003c\/strong\u003e for safer installations and compliance with modern plumbing standards.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNeoprene\/Stainless Steel\u003c\/strong\u003e build combines a flexible, chemical-resistant gasket with a corrosion-resistant band for lasting performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e4 in. hub-to-hub connections\u003c\/strong\u003e on both ends ensure compatibility with standard 4-inch hub piping.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTemperature rating up to 220°F\u003c\/strong\u003e, suitable for typical DWV applications and occasional exposure to higher temps.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSingle-pack convenience\u003c\/strong\u003e (1 piece per package) for straightforward replacements.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIAPMO certified\u003c\/strong\u003e status: No; \u003cstrong\u003eNSF listed\u003c\/strong\u003e status: No — designed for standard uses where these certifications aren’t required.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eApplications and use cases\u003c\/p\u003e \u003cp\u003eThe ProLine BK 4 in. No Hub Coupling is ideal for replacing damaged no-hub connections in 4-inch piping runs, making quick repairs in basements, crawlspaces, or service closets. Its neoprene gasket maintains a tight seal even when pipes are slightly out of alignment, reducing the need for precise cuts and extensive rework. Use it to join sections of hubless pipe in new installations or to retrofit aging systems that rely on clamp-on, no-hub connections.\u003c\/p\u003e \u003cp\u003eHow it stands apart from generic solutions\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eMaterials engineered for longevity\u003c\/strong\u003e: stainless steel band resists corrosion, while neoprene provides a reliable, flexible seal across temperature variations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClear compatibility\u003c\/strong\u003e: designed specifically for 4\" hub-to-hub piping, reducing guesswork during installation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePractical for field crews\u003c\/strong\u003e: simple, straightforward replacement part that minimizes downtime on job sites.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eSpecifications at a glance\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ProLine\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSub Brand\u003c\/strong\u003e: BK Products\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type\u003c\/strong\u003e: No Hub Coupling\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEnd 1 Diameter\u003c\/strong\u003e: 4 in\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEnd 1 Type\u003c\/strong\u003e: Hub\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEnd 2 Diameter\u003c\/strong\u003e: 4 in\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEnd 2 Type\u003c\/strong\u003e: Hub\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Neoprene\/Stainless Steel\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Temperature\u003c\/strong\u003e: 220°F\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLead Content\u003c\/strong\u003e: Lead-Free\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber in Package\u003c\/strong\u003e: 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIAPMO Certified\u003c\/strong\u003e: No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNSF Listed\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Proline","offers":[{"title":"Default Title","offer_id":52201787326738,"sku":"4031767","price":8.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0928\/1024\/8466\/files\/4031767_A.eps_High.jpg?v=1776380329","url":"https:\/\/nationalhardwaregroup.com\/products\/proline-bk-products-4-in-hub-sizes-x-4-in-d-hub-sizes-neoprene-stainless-steel-no-hub-coupling-1-p","provider":"National Hardware Group","version":"1.0","type":"link"}