These Threaded Seals are stalled wherever you desire to place a drain or shut off valve. Just as the name implies the interior of the gasket has threads for screwing the drain or shut off value into it.

It requires a 1.25" hole to be cut. 

These Threaded Seals are NOT to be used with the RainStation Rain Barrel. Replacement threaded seals for the RainStation Rain Barrel are here