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The BSC PREFERRED DIB20664 is a 1-1/2 x 8 inch branch tailpiece designed for residential and light commercial drain line applications. This fitting connects a branch drain outlet to the main drain line and supports both universal slip-joint and direct connect installation methods. The 7/8 inch O.D. branch outlet is compatible with rubber hose and clamp assemblies, giving installers flexibility in tight or non-standard configurations. Plumbers and drain service techs use this type of tailpiece to extend or branch P-trap assemblies under sinks and lavatories. At 0.19 pounds, it is lightweight and easy to handle during installation.
This branch tailpiece is suited for under-sink drain assemblies in kitchens and bathrooms where a secondary drain connection is needed alongside the main P-trap outlet. The universal slip-joint design accommodates standard drain plumbing without requiring specialized fittings. The rubber hose and clamp connection method makes it adaptable for retrofit installations where rigid connections are not practical.
Designed as an OEM-style replacement or retrofit fitting for standard 1-1/2 inch residential and light commercial drain assemblies using slip-joint connections.
Installation is typically performed by a licensed plumber or qualified drain service technician. Shut off the water supply and clear standing water from the drain line before beginning work. Hand-tighten slip-joint nuts to avoid cracking — use slip-joint pliers only as needed to achieve a leak-free seal. Ensure the rubber hose and clamp connection at the branch outlet is seated fully and the clamp is secured evenly.
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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