This bronze, temperature and pressure relief valve has a 4 3/4-inch long thermostat, 6 7/8-inch long shank, and 1 1/2 x 6 7/8-inch body. The MNPT inlet and FNPT outlet each measure 3/4 inch. This auto re-seating valve has a stainless steel spring, a factory-set pressure of 150 psi, and a maximum temperature of 210 Degrees F with 205,000 BtuH. It is CSA 4.4 compliant.