Sierra 18-2588 Transmission Oil CoolerFeatures: Shipped bare metal; Ready for primer and factory paint finish; Specifications: Waterhose Connection Size:; 1 1/4" or 31.8mm; NPT Inlet/Outlet Oil Fitting; 9' x 2' and 3/8'; Oil:; 6 GPM MAX; Water:; 25 GPM MAX; Tube Bundle Overall Length:; 10" or 254mm; Water Inlet and Outlet:; 1 1/4" or 31.8mm; Length 12" or 304.8mm; ;