Avanhitch Freeze Relief Drain Guard 3in & 4in – Fits 4 SCH 40 SDR 35 DWV

Overview

Meet Avanhitch Freeze Relief, a purpose built vent designed to sit between your sump discharge and the outdoor drainage path. It is engineered to relieve discharge pressure and support overflow drainage without functioning as a check valve. The unit fits both 3 inch and 4 inch drain lines and is compatible with common pipe configurations such as 4 SCH 40, 4 SDR 35, and 4 DWV. When backpressure builds, this compact vent provides a secondary path to ease the load, which can help prevent cracks in pipes and basement flooding scenarios. If backflow does occur, inspect your sump pump check valve or drainage system for proper operation.

Key benefits

• Dual size outlet covers 3 and 4 inch drains in one part, simplifying installs and stocking.
• Freeze relief safety offers an alternate vent path during buried line icing or clogs, reducing back pressure on the system.
• Above grade installation is straightforward; no valves or seasonal switching required for setup and access.
• All season performance supports winter freeze ups and heavy rainfall, helping minimize standing water and odors near the foundation.
• Rugged housing and large downward vents resist debris and enable quick inspection for ongoing reliability.

Installation and usage

Designed to sit between the 1-1/2 inch sump discharge and the outdoor drain line, it can work with typical check valves and unions. Install above grade with the vents facing downward to promote proper drainage. This unit is intended to relieve discharge pressure and assist with overflow drainage; it is not a backflow preventer. If backflow occurs, check overall drainage system operation.

Durability and maintenance

Built to perform in cold and wet climates, the impact resistant body stays robust through freeze thaw cycles. The large downward facing vents resist debris entry and are easy to inspect or clear for long term reliability. Regular checks can help maintain steady drainage performance across seasons.