This temperature and pressure relief valve has a maximum temperature of 210 Degrees F with 500,000 BtuH, and a factory-set pressure of 150 psi. The thermostat length is four inches, the shank length is 6 7/8 inches, and the bronze body measures 1 19/32 x 6 7/8 inches. It has a one-inch MNPT inlet and a 3/4-inch FNPT outlet. This valve is auto re-seating and has a stainless steel spring. It meets CSA 4.4 standards.