2 in. diameter standard oil cooler accepts 1 1/4 in. water hoses and 1/2 in. NPTF oil connections. 9 in. x 1 1/4 in. Oil Cooler | Seakamp Engineering 29144 Seakamp universal cooler fits many engine oil or transmission fluid cooling applications 9 in. core length 12 in. overall length 2 in. diameter 1 1/4 in. water hose connections 1/2 in. NPT oil connections 1/8 in. NPT water drain plug Copper core construction Recommended working pressure up to 150 psi Replaces R & D Enterprises Inc 209EE05C