These drain test plugs or drain stoppers as they are also called consist of two steel plates with a rubber insert. As the central steel wing nut is tightened, the steel plates push together and force the rubber to expand, thus creating a water tight seal within the pipe. By replacing the centre cap with a test nipple, you can then also pressure test the pipe using a drain test kit.
12" / 300mm Drain test plug.
Will fit pipes with a minimal internal diameter of 296mm and maximum internal diameter of 320mm
1" Outlet
Max allowable back pressure 7 psi.
