Two Female 1/4" Inverted Flare Inlets x 3/8" Female NPT Outlet. For use on RVs with dual propane tanks: 11" w.c. (0.4 psi) pressure setting. Maintains consistent gas pressure and automatically switches from empty tank to full one. Remove empty cylinder for refill without interrupting propane supply. Built-in gas gauge to indicate empty cylinder. 160,000 BTU/hr capacity.