The AcDelco 88996645 Allison 1000 Transmission Cooler Line Fitting is a perfect way to upgrade the performance of your 2500/3500HD Silverado | Sierra 2003 or newer. This OEM replacement fitting is 7/8”, and it is compatible with both 2003 and newer cooler lines and converter housings. Whether you are looking for better cooling performance or just replacing an old fitting, this high-quality product from AcDelco makes for the ideal choice. And with two required per truck, you can make sure that all your connections are up to par. Don’t settle for anything less - the AcDelco 88996645 Allison 1000 Transmission Cooler Line Fitting gives you consistent reliable cooling performance every time.