ALLSTAR Double Pass Oil Cooler will increases engine life by reducing operating temperatures. Oil not only lubricates but also removes a large amount of heat from the engine. These coolers have a 1/2inchNPT female bung commonly used for connecting a temperature sending unit and have built in flanges for easy mounting. 15X9X3 inches. Normal constant operating pressure 80 psi. Maximum constant operating pressure 100 psi. Burst pressure 170 psi.