Series TWS Through the Wall Water Supply Shutoffs are used to provide outside access to a building water supply for start-up, winterizing and servicing of irrigation sprinkler systems. They feature a durable bronze body and shaft, one piece valve plunger, tamper resistant key operated hydrant, manual drain port, exterior chrome finish and union connection for ease of installation of a backflow preventer. Maximum Working Pressure: 175psi (12.06 bar).