Oatey PP554W Slip Joint Extension Coupling 1-1/2 Inch

Product Description

The OATEY PP554W is a straight slip joint extension coupling designed for plastic drain line repairs and extensions in residential plumbing applications. Sized at 1-1/2 inches, it uses a slip joint connection to allow quick, tool-minimal assembly without solvent cementing. The fitting ships with reducing washers that allow it to adapt down to 1-1/4 inches, giving the installer flexibility when connecting mismatched drain line sizes. At 0.12 pounds, it is lightweight and straightforward to handle in tight under-sink cabinet spaces. Licensed plumbers and skilled DIYers use this fitting to extend or repair P-trap assemblies and drain tailpieces on lavatory and kitchen sink drains.

This coupling is used in residential drain, waste, and vent (DWV) systems, most commonly under bathroom lavatories and kitchen sinks where P-trap assemblies require extension or realignment. The included reducing washers make it suitable for both 1-1/2 inch standard drain lines and 1-1/4 inch lavatory drain outlets, covering the two most common household drain sizes without additional adapters. It is a one-piece-per-package unit intended for single-point repairs or new rough-in work where a slip joint extension is specified.

Key Features

• Straight slip joint design allows adjustment and disassembly without cutting pipe
• Includes reducing washers to fit both 1-1/2 inch and 1-1/4 inch drain lines
• White plastic construction resists corrosion in wet drain environments
• Lightweight at 0.12 pounds for easy handling in confined cabinet spaces
• Sold individually for single-point repair or replacement jobs

Compatibility

Designed as an OEM-style replacement and repair fitting for residential plastic slip joint DWV drain assemblies in 1-1/2 inch and 1-1/4 inch configurations.

Installation Notes

Installation is typically performed by a licensed plumber or qualified DIYer working on residential drain lines. Shut off the water supply and clear standing water from the trap assembly before beginning disassembly. Slip joint fittings rely on a compression washer for the seal - ensure the washer is seated squarely and the slip nut is hand-tightened then snugged with channel-lock pliers; do not overtighten plastic slip nuts, as cracking the nut or fitting body is a common failure. Local plumbing codes based on the IPC or UPC govern drain fitting material and configuration requirements and should be consulted before installation.