Adjustable (3-15psig) Stainless Pressure and Vacuum ValveUse this sanitary pressure and vacuum relief valve (PRV) to help ensure pressure and vacuum do not exceed the design tolerance of the stainless conical jacketed fermenter and 4 in 1 conical fermenters. Adjustable pressure can be set to release pressure at desired pressure, and will break a vacuum. Connects to a 1. 5" tri clamp compatible port. Warning: before each use ensure that the relief valve is operating as designed and that it is releasing