U-Cooler Assembly | Crusader 98123 Combination transmission and engine oil cooler used on Crusader big block marine engines from 1991 and later. OEM Crusader u-cooler assembly Fits Crusader big block engines from 1991 and later Not for use on Crusader MPI fresh water cooled engines 1 1/4 in. water hose connections Includes 1/4 in. NPT zinc anode Original Crusader