This Second-Stage BACK MOUNT LP gas regulator is designed for domestic installations. Easy system checks are possible due to the built-in gauge taps on both the upstream and downstream sides. Equipped with over-pressure protection and internal relief valve and travel stop on the closing cap. 1/2" Female Pipe Inlet x 3/4" Female Pipe Outlet. Operating inlet pressure: 10 psig. 1,000,000 BTU/hr.