Harley Oil Cooler Adapter. For twin cam TC88 Harley Davidson engine. Easy to install, goes on at oil filter housing with minimal fuss. CNC Machined for easy fitting and precise oil control------ Supplied with straight 3/8” spigot oil line fittings---- Extended oil filter threaded spigot and half nut---- “O” Ring---- Oil cooler adapter---- And instructions------ You do need to remove the crank sensor to install and renew the oil filter once the adapter is fitted, but this does not harm it in any way------ An oil cooler will cool the running temperature down considerably (depending on type and brand of cooler used) weather in the city or out on the highway------ Until this adapter was developed it was near impossible to put an oil cooler onto a Twin Cam TC88 engine