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The BSC PREFERRED DIB66-4W is a branch tailpiece designed for drain line assemblies in residential and light commercial plumbing applications. Measuring 1.5 inches by 8 inches with a 7/8-inch outer diameter branch outlet, this fitting serves as a mid-run connection point in P-trap and drain configurations beneath sinks and lavatories. It accepts both universal slip-joint and direct-connect installation methods, giving plumbers flexibility when working with existing drain assemblies. Compatible with rubber hose and clamp setups, this tailpiece covers common field conditions where rigid connections are not practical. Plumbers and drain service technicians carry this part as a standard repair and replacement component.
This branch tailpiece is suited for under-sink drain installations in kitchens, bathrooms, and utility areas. The slip-joint or direct-connect design accommodates a range of existing drain configurations without requiring additional adapters in most installations. The rubber hose and clamp compatibility makes it a practical choice when connecting to flexible drain lines or when working in tight under-cabinet spaces where rigid fittings are difficult to seat properly.
Designed as an OEM-style replacement tailpiece for standard 1.5-inch residential and light commercial sink drain assemblies.
Installation is typically performed by a licensed plumber or experienced drain technician. Shut off the water supply and clear the trap before removing the existing tailpiece. Hand-tighten slip-joint nuts first to verify alignment, then snug with pliers — do not overtighten plastic slip-joint nuts. When using rubber hose and clamp, ensure the clamp seats evenly on the hose bead and the connection is leak-tested after installation.
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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