Gates 18623 GATR Small I.D. Coolant Hose, .25" Hose ID, 4.8" Centerline Length, black. Engineered to resist electrochemical degradation and has all the quality features of Gates molded coolant hose. Can be used for coolant, water, air, and marine applications. Designed OEM style factory-molded hose to fit today's smaller, tighter-fitting engine compartments and meets SAE 20R3 Type EC Class D-1 and D-2 specifications. Not intended for use of fuel or oil transfer applications. Fits 2007-1999 Chevrolet, Silverado Series Pickup, V-8 5.3 L, Throttle Body To Eng.