Flex-a-lite 3951 Engine Oil Cooler Kit Overall dimensions of 5" x 20" x 3/4" Easy to follow instructions with complete hardware, hose and fittings for complete installation Billet aluminum fittings offer more secure host connections Features 1/2" barb with a tube diameter of 1/2" for proper fit Designed for filters with 3/4", 13/16", 18mm, 20mm, or 22mm threads