Exhaust Tube Bellows – Fits MerCruiser R/MR/Alpha One & Bravo I/II/III (Replaces 78458A1, 18-2760) 380HP 1 x Complete Lower Unit

1 x Complete Lower Unit Assembly with pre-installed water pump

Carefully disconnect any clamps or fittings and remove the old filter element

Ensure the engine is cool

What happens if a bellows fails

Restores proper cooling function to prevent engine overheating

Exhaust Tube Bellows – Fits MerCruiser R/MR/Alpha One & Bravo I/II/III (Replaces 78458A1, 18-2760) 380HP 1 x Complete Lower UnitProduct Details This marine Exhaust Tube Bellows is designed for MerCruiser sterndrives, including R MR Alpha One models from 19831990 (serial number 6225577 & up), Bravo I, II, and III models from 1988 and later (serial number OB664190 & up), and Blackhawk models from 19941995 (serial number 0F18677 & up). It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 78458A1, Sierra 18 2760, GLM 89150, and Mallory