Regitar USA Knock Sensor f/Mercruiser Inboard Engines: MCM V-6 V-8 (305, 350 496 CID) MPI Engines w/ECM 555 [RMH001] Boat Outfitting | Hull Protection and they guarantee it for

and they guarantee it for life

Ability to drain holding tanks at home

The length of the double swing arm is 12"

The dual action pump is 66% larger in diameter than any competitive market

The pocket mount is installation dependent

Regitar USA Knock Sensor f/Mercruiser Inboard Engines: MCM V-6 V-8 (305, 350 496 CID) MPI Engines w/ECM 555 [RMH001] Boat Outfitting | Hull Protection and they guarantee it forKnock Sensor for Mercruiser Inboard Engines: MCM V 6 & V 8 (305, 350 & 496 CID) MPI Engines with ECM 555 Knock Sensor for Mercruiser Inboard Engines: MCM V 6 & V 8 (305, 350 & 496 CID) MPI Engines with ECM 555. Engine Brand: Mercury Mercruiser Fitment: Mercruiser 5. 7L 8. 2L Mariner 135HP 300HP Brochure (pdf)