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The BSC PREFERRED DIB812-5 is a 1-1/4 inch slip-joint flexible extension tube used in drain line assemblies under sinks and in similar plumbing applications. The flexible construction accommodates misalignment between trap arms and drain outlets, reducing the need for additional fittings or rework during installation. Compatible with both plastic and brass slip-joint fittings, this extension tube suits a wide range of residential and light commercial drain configurations. It is typically installed by licensed plumbers or experienced plumbing contractors as part of P-trap and drain assembly work.
This extension tube is suited for residential and light commercial under-sink drain installations where alignment between the trap and the drain stub-out is not perfect. The flexible design makes it a practical choice for retrofit and replacement work in kitchens and bathrooms where rigid extensions would require additional offsets. It ships individually on a card and weighs approximately 0.11 pounds.
Designed as an OEM-style replacement for standard 1-1/4 inch slip-joint drain extension tube applications in residential and light commercial plumbing systems. Works with plastic or brass slip-joint assemblies.
Installation is typically performed by a licensed plumber following applicable IPC or local plumbing code requirements. Before servicing drain components, shut off the water supply and clear the trap of standing water. Hand-tighten slip-joint nuts first, then snug with pliers — avoid over-tightening, which can crack plastic fittings or distort seals. Inspect the slip-joint washers before reassembly and replace if worn.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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