ProLine BK Products 4 in. No Hub Coupling 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.
Why professionals choose this No Hub Coupling:
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Lead-Free construction for safer installations and compliance with modern plumbing standards.
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Neoprene/Stainless Steel build combines a flexible, chemical-resistant gasket with a corrosion-resistant band for lasting performance.
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4 in. hub-to-hub connections on both ends ensure compatibility with standard 4-inch hub piping.
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Temperature rating up to 220°F, suitable for typical DWV applications and occasional exposure to higher temps.
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Single-pack convenience (1 piece per package) for straightforward replacements.
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IAPMO certified status: No; NSF listed status: No — designed for standard uses where these certifications aren’t required.
Applications and use cases
The 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.
How it stands apart from generic solutions
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Materials engineered for longevity: stainless steel band resists corrosion, while neoprene provides a reliable, flexible seal across temperature variations.
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Clear compatibility: designed specifically for 4" hub-to-hub piping, reducing guesswork during installation.
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Practical for field crews: simple, straightforward replacement part that minimizes downtime on job sites.
Specifications at a glance
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Brand: ProLine
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Sub Brand: BK Products
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Product Type: No Hub Coupling
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End 1 Diameter: 4 in
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End 1 Type: Hub
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End 2 Diameter: 4 in
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End 2 Type: Hub
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Material: Neoprene/Stainless Steel
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Maximum Temperature: 220°F
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Lead Content: Lead-Free
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Number in Package: 1
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IAPMO Certified: No
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NSF Listed: No
