Oil Tank Fusible Burner Safety ValveFusible valves are approved for kerosene and No. 2 fuel oil. Pressure rated for 10 P.S.I. Valves with standard hand wheel close at about 165 F. ambient temperature. Double seal to prevent stem leaks. All fusible valve rubber washers and o-rings are made of Viton or equivalent material. 3/8" x 1/4".