Oatey K820-20 Plumber's Patch Stub Out Moisture Guard 2 Pack

Product Description

The OATEY K820-20 is a closed-cell foam moisture guard designed to seal around pipe stub-outs at the wall, blocking water infiltration that can lead to wall damage and mold growth. Sold as a 2-pack, the kit includes one patch sized for 0.5-inch copper pipe and one patch sized for 0.5-inch iron pipe. Each patch features a self-adhesive backer, eliminating the need for glue or additional adhesives during installation. This product is commonly installed by plumbers during tub spout and showerhead rough-in or finish work where the pipe exits the wall surface.

The K820-20 is suited for residential plumbing applications where a pipe stub-out penetrates a wall in a wet area such as a bathroom or shower surround. The foam construction conforms around the pipe and presses flush to the wall surface, creating a barrier against moisture migration behind the wall finish. Typical installations include tub spout rough-ins, showerhead arm penetrations, and similar supply-line wall exits. The 2-pack format covers both copper and iron pipe stub-outs in a single kit, making it a practical add-on for bathroom remodel and rough-in jobs.

Key Features

• Closed-cell foam construction resists moisture absorption and provides a reliable water barrier
• Self-adhesive backer allows tool-free installation with no glue required
• 2-pack includes one patch for 0.5-inch copper pipe and one patch for 0.5-inch iron pipe
• Designed for tub spout and showerhead stub-out applications in wet areas
• Prevents water from migrating behind the wall finish at pipe penetration points

Compatibility

Designed to fit 0.5-inch copper pipe stub-outs and 0.5-inch iron pipe stub-outs. Suitable for tub spout and showerhead wall penetrations in residential plumbing installations.

Installation Notes

Installation is performed by a licensed plumber or qualified tradesperson as part of bathroom rough-in or finish plumbing work. Shut off the water supply before working on any connected pipe or fitting. Clean and dry the wall surface and pipe stub-out before applying the self-adhesive patch to ensure proper adhesion. Follow all applicable IPC requirements for wet-area pipe penetration sealing.

Technical Specifications

• Package Contents: 2 patches (one for 0.5-inch copper pipe, one for 0.5-inch iron pipe)
• Pipe Compatibility: 0.5-inch copper, 0.5-inch iron pipe
• Material: Closed-cell foam with self-adhesive backer
• Weight: 0.057 pounds
• UPC: 00046224052746

Standard Information

• Brand: OATEY
• Manufacturer Part Number: K820-20