Quicksilver 79953Q04 Lower Unit Gear Lube Drain Fill Hole Screw Seal

The Quicksilver 79953Q04 lower unit gear lube drain and fill hole screw and seal is an essential maintenance component for MerCruiser sterndrives, Mercury and Mariner outboards (excluding Verado series). This OEM replacement screw and seal combination is designed to work with 3/8-16 drain and fill holes, providing a secure seal that prevents gear lube leakage and blocks water intrusion into the gear case.

Key Features:

• Compatible with 3/8-16 drain and fill hole threads on all MerCruiser sterndrives, Mercury and Mariner outboards except Verado series
• Critical seal component ensures proper seating of the drain/fill hole screw in the lower unit
• Prevents gear lube from leaking out of the gear case during operation
• Blocks water from seeping into the gear case, protecting against corrosion and damage
• Non-magnetic plug screw version for standard applications
• Genuine Quicksilver OEM quality, backed by over 65 years of marine industry expertise

Regular replacement of the drain and fill hole screw seal during gear lube service intervals is critical for maintaining the integrity of your lower unit. Using a worn or damaged seal can lead to water contamination of the gear lube, resulting in costly gear case damage. This genuine Quicksilver replacement ensures proper fit and reliable sealing performance.