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