Oatey 791BD-20BN-1 Extension Tube 1-1/4 in Brass

Product Description

The OATEY 791BD-20BN-1 is a brass extension tube designed for drain line connections in residential and light commercial plumbing applications. Measuring 1-1/4 inches in outer diameter and 16 inches in length, this tube extends or completes P-trap assemblies beneath sinks and lavatories. The double slip joint connection allows for tool-free adjustment and alignment, making it a practical choice for service work where precise positioning is needed. Licensed plumbers and experienced DIYers install this type of fitting when connecting sink drains to wall or floor stub-outs. The brass construction provides corrosion resistance suitable for wet drain environments.

This extension tube is used in residential bathroom and kitchen sink drain assemblies, typically between a P-trap and the wall drain outlet. It is well suited for installations where additional tube length is required to bridge the gap between the trap arm and the drain stub-out. The double slip joint design accommodates minor misalignments during installation, reducing the need for cutting or refitting. Plumbers reach for this part during new installations, remodels, and fixture replacements where the existing drain rough-in does not align perfectly with the fixture outlet.

Key Features

• 1-1/4 inch outer diameter fits standard residential sink drain configurations
• 16-inch length provides extended reach for deep cabinet or offset drain installations
• Double slip joint connection allows adjustment without cutting or soldering
• Brass construction resists corrosion in continuous wet drain service
• Suitable for residential and light commercial sink drain applications

Compatibility

Designed as an OEM-style replacement and new-installation fitting for standard 1-1/4 inch residential sink drain assemblies using slip joint P-trap configurations.

Installation Notes

Installation is typically performed by a licensed plumber or qualified tradesperson. Shut off the water supply and clear the drain of standing water before disassembling existing trap components. Slip joint nuts should be hand-tightened first to allow final alignment, then snugged with channel-lock pliers — avoid over-tightening, which can crack slip joint nuts. Verify the completed assembly for leaks by running water and inspecting all joints per local plumbing code requirements.

Technical Specifications

• Outer Diameter: 1-1/4 inches
• Length: 16 inches
• Connection Type: Double Slip Joint
• Material: Brass

Standard Information

• Brand: OATEY
• Manufacturer Part Number: 791BD-20BN-1