3/4" TestanDrain with Pressure Relief and 17/32" Orifice The lightweight and compact Model 1011A is a 175 PSI-rated, single-handle, ball valve with a pressure relief valve designed to provide both the test and express drain functions required for a wet fire sprinkler system. The Model 1011A ball valve eliminates the numerous connections the traditional assembly loop requires, saving time, space, and money.  The TESTanDRAIN Model 1011A also features a tamper-resistant test orifice and sight glass, a tapped port for system access, a pressure relief valve, and optional orifices in all specifiable sizes.