The Gear Lube Drain and Fill Hole Screw Seal 79953Q04 is a critical component for all MerCruiser sterndrives and most Mercury/Mariner outboards. This non-magnetic version is used with 3/8-16 drain/fill screws to ensure a proper seat, retaining gear lube while keeping damaging water out of the gearcase. Always replace the seal during gear lube changes to prevent catastrophic damage to internal components.
- Fits all MerCruiser drives and most Mercury/Mariner outboards (except Verado)
- Specifically for use with 3/8-16 drain and fill hole screws
- Ensures proper seating to retain gear lube and block water intrusion
- Non-magnetic plug screw version
- Produced to Mercury Marine original equipment manufacturer specifications
