Dranjer FR-2

For use in systems when water must drain through to sump pit, but system vacuum must be maintained.  The Dranjer FR-2 is similar to the DR2 but has a metal stopper instead of plastic.  Great for oddly sized drains since the flange can be cut to size.

Dranjer valves keep your home energy efficient so you only exhaust sub slab gasses and not conditioned air from the home.