8M2000171 Mercruiser Transmission/Gear Cooler Also 863842T1and 863842T02 9.74 x 1.24 Hose Barb, 3/8" NPT Fits Mercury Marine 350 MAG MPI Horizon MIE, 350 MAG MPI MIE, 350 MAG MPI SKI, 383 Stroker, 5.7L MPI HORIZON MIE, 5.7L MPI, MIE, 5.7L MPI MIE EC, 5.7L MPI SKI, 6.2L MPI HORIZON MIE, 6.2L MPI MIE, 6.2L MPI MIE EC serial number 0M313035 and up. Also fits in-line 1:1 Velvet Drive