Bk 158-876 Brass Waste Adapter 1-1/4 X 1-1/2 in

Product Description

The BK 158-876 is a brass waste adapter designed to connect a 1-1/4-inch drain outlet to a 1-1/2-inch drain line in residential and light commercial plumbing applications. Commonly referred to as a Desanco-style fitting, this adapter features a brass body and brass ring paired with a zinc nut, providing a reliable transition between mismatched drain pipe sizes. It is a standard slip-joint fitting used by licensed plumbers and experienced DIYers when replacing or extending P-trap assemblies under sinks and lavatories.

This waste adapter is well suited for under-sink drain installations where a 1-1/4-inch tailpiece or trap arm must connect into a 1-1/2-inch drain rough-in. Typical applications include kitchen sinks, bathroom lavatories, and utility basins. The slip-joint design allows for quick alignment and hand-tightening during assembly, making it a go-to component during drain rough-in, remodel, or fixture replacement work.

Key Features

• Brass body and brass ring for corrosion resistance in wet drain environments
• Zinc nut secures the slip-joint connection
• Desanco-style fitting compatible with standard slip-joint drain assemblies
• Adapts 1-1/4-inch drain outlet to 1-1/2-inch drain line
• Sold individually for single-point replacement or repair

Compatibility

Designed as an OEM-style replacement or new-installation slip-joint waste adapter for standard residential and light commercial sink drain assemblies using 1-1/4-inch to 1-1/2-inch connections.

Installation Notes

Installation is performed by a licensed plumber or qualified tradesperson in accordance with local plumbing codes and IPC guidelines. Shut off the water supply and clear standing water from the drain line before beginning work. Hand-tighten the zinc nut to seat the slip joint, then snug with channel-lock pliers — do not overtighten, as brass fittings can crack under excessive torque. Inspect for leaks after restoring flow.

Technical Specifications

• Inlet Size: 1-1/4 inches
• Outlet Size: 1-1/2 inches
• Body Material: Brass
• Ring Material: Brass
• Nut Material: Zinc
• Weight: 0.17 pounds
• Sold As: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 158-876