Bk 158-976 Brass Waste Adapter 1-1/4 X 1-1/2 in

Product Description

The BK 158-976 is a brass waste adapter designed to connect a 1-1/4-inch drain outlet to a 1-1/2-inch drain line. The adapter features a brass body and brass ring with a zinc nut, providing a durable, corrosion-resistant assembly suitable for sink drain connections. This fitting is also commonly referred to as a Desanco-style fitting. It is a standard component in drain assembly work and is installed by licensed plumbers and experienced DIYers working on lavatory or kitchen sink drainage systems.

This adapter is used in residential and light commercial plumbing applications where a size transition is needed between a fixture drain tailpiece and a larger drain line. Typical installations include lavatory sinks and bar sinks where a 1-1/4-inch tailpiece must tie into a 1-1/2-inch trap or drain stub-out. The fitting is sold individually and suits standard slip-joint drain configurations.

Key Features

• Brass body and ring for corrosion resistance and durability
• Zinc nut included for secure slip-joint connection
• Transitions from 1-1/4-inch to 1-1/2-inch drain lines
• Desanco-style fitting — widely recognized in the trade
• Lightweight at 0.17 pounds for easy handling during installation

Compatibility

Designed as an OEM-style replacement or standard component for residential and light commercial slip-joint drain assemblies requiring a 1-1/4-inch to 1-1/2-inch waste line transition.

Installation Notes

Installation is performed by a licensed plumber or qualified tradesperson working on sink drain assemblies. Shut off the water supply and ensure the drain line is clear before beginning work. Hand-tighten the slip-joint nut first, then snug with channel-lock pliers — do not overtighten, as brass and zinc components can crack under excessive torque. Verify the connection is leak-free before returning the system to service.

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: 158-976