1.6.4 Ball valves at the tank yard shall have working pressure of 1,000 phis. W.O.G., it shall be stainless steel, one piece body, graphite packing and fire safe designed. Ball valves for tenant service outlet shall have working pressure of 300 psi.W.O.G., forged brass body, chrome plated brass ball, brass stem, double packing of TEFLON and NYLON and stainless steel handle.