THE LID™ Backwater Basin Cover — Radon & Soil Gas Seal by Radon Home Defence

THE LID™ — Backwater Valve Basin Cover for Radon & Soil Gas Mitigation

The only backwater basin cover engineered to seal out radon, soil gas, VOCs, and moisture — while keeping your cleanout accessible.

For years, the backwater valve basin has been one of the most overlooked entry points for radon and soil gases in Canadian homes. THE LID™ by Radon Home Defence changes that. Its proprietary dual-seal technology creates an airtight barrier over your backwater valve basin, blocking radon gas, volatile organic compounds, moisture, and sewer gases from entering your living space.

Unlike generic covers or DIY sealing attempts, THE LID is purpose-built for this application — CAN/CGSB 149.11 and 149.12 compliant, meaning it meets Canadian national standards for radon mitigation. A built-in knockout port allows integration with an active radon mitigation system if sub-slab depressurization alone isn't enough.

Why Your Backwater Basin Matters

Most radon mitigation focuses on sump pits and floor cracks — but the backwater valve basin is an equally significant pathway for soil gas entry. If your home has a backwater valve (most newer Canadian homes do), an unsealed basin can undermine your entire mitigation system. THE LID seals this gap.

Features

• Dual-Seal Technology — proprietary gasket system creates an airtight, watertight seal over the basin
• Radon suction point knockout — optional port for connecting to an active radon mitigation system
• Easy maintenance access — lid design permits annual backwater valve cleanout without breaking the seal
• CAN/CGSB 149.11 & 149.12 compliant — meets Canadian standards for radon mitigation installations
• Simple installation — no specialized tools required
• Blocks radon, soil gas, VOCs, sewer gas, and moisture
• Designed and manufactured in Ontario, Canada

Specifications

Ideal For

• Homes with backwater valve basins (standard in most new Canadian construction)
• Professional radon mitigators looking to seal all soil gas entry points
• Homeowners with elevated radon levels who have already sealed the sump pit
• New construction radon rough-ins requiring CGSB-compliant components