Thermwell OSS6H Switch Plate Sealer White 6 Pack

Product Description

The THERMWELL OSS6H is a closed cell foam switch plate sealer designed to reduce air infiltration around electrical outlets and switch plates in exterior and interior walls. Each pack contains six pre-cut foam gaskets that install behind standard switch plates and outlet covers to block drafts, moisture, and conditioned air loss at common wall penetration points. At 2 pounds per unit of measure, the OSS6H ships in bagged packaging suitable for jobsite use. This product is UL and CSA approved, making it appropriate for residential and light commercial weatherization work performed by electricians, HVAC technicians, and energy auditors.

The OSS6H is suited for residential weatherization, energy retrofit projects, and new construction air sealing applications. Installers use these gaskets on standard toggle switch plates and duplex outlet covers in exterior walls where air leakage is common. The six-pack format allows efficient coverage of multiple boxes per trip. This product is commonly applied during HVAC commissioning, blower door testing preparation, or building envelope tightening projects.

Key Features

• Closed cell foam construction resists compression and moisture absorption
• Six gaskets per pack for efficient multi-outlet installations
• White color blends with standard white switch plates and outlet covers
• UL and CSA approved for confidence on inspected residential and commercial jobs
• Bagged packaging keeps gaskets clean and contained on the jobsite

Compatibility

Designed as an OEM-style replacement and standard fitment for residential and light commercial switch plates and duplex outlet covers used in air sealing and weatherization applications.

Installation Notes

Switch plate sealers are installed by electricians or general contractors during rough-in completion or weatherization retrofits. Always shut off power to the circuit at the breaker panel before removing any outlet or switch cover plate. Gaskets are placed behind the cover plate and should lie flat against the wall surface without bunching. Work should comply with applicable NEC requirements and local building codes governing air sealing at electrical penetrations.