This bronze, temperature and pressure relief valve is auto-re-seating and has a stainless steel spring. Its pressure is factory-set at 150 psi, with a maximum temperature of 210 Degrees F and 105,000 BtuH. The MNPT inlet and FNPT outlet are each 3/4 inches. The body measures 1 15/32 x 4 5/16 inches, with a thermostat length of 1 7/8 inches and a shank length of 2 5/16 inches. This valve meets CSA 4.4 standards.