551699 Heater Core Bypass Hose Coolant Crossover for LS/LT Engines, 5/8" and 3/4" Ends, U Shape Rubber Water Pump Bypass Hose with 2 Clamps

This 551699 heater core bypass hose is an aftermarket coolant crossover hose for LS/LT heater core delete or bypass applications. It is used to loop the heater hose outlets on LS/LT water pumps when the heater core is no longer in use. The hose has one 5/8 in. end and one 3/4 in. end for matching heater hose outlet sizes. The package includes 1 black U-shaped rubber bypass hose and 2 clamps. Before ordering, compare your engine setup, water pump outlet sizes, and cooling-system layout with the product dimensions and application notes. This product is not an OEM or genuine vehicle manufacturer part and should not be used as a vehicle-model-only fitment item. It is intended for modified LS/LT cooling systems, engine swaps, and heater core delete/bypass setups with matching ports.

• 551699 bypass hose: aftermarket replacement for ICT Billet-style 551699 heater core delete / coolant bypass hose used on LS/LT water pump heater outlets.
• 5/8" and 3/4" ends: one hose end is sized for 5/8 in. heater hose ports and the other for 3/4 in. heater hose ports; verify your water pump outlet sizes before ordering.
• For heater core delete setups: designed to loop the heater hose outlets when the heater core is no longer used; this part does not restore cabin heat or repair the heater core itself.
• LS/LT application range: suitable for 1998-newer LS/LT-based engine swap or modified cooling-system setups with matching 5/8 in. and 3/4 in. heater outlets; avoid using by vehicle model alone.
• Package includes: 1 black U-shaped rubber bypass hose and 2 clamps. This is an aftermarket seller package, not an OEM or genuine vehicle manufacturer part.