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Add to CartLower unit gear lube drain and fill hole screw and seal 8M0058389 is used with 3/8-16 drain/fill hole screw on all MerCruiser sterndrives, Mercury and Mariner outboards except the Verado series. It is very important to use the seal to make sure the drain/fill hole screw seats properly to retain the gear lube in the gear case and keep damage causing water out of the gear case.
All MC-1, Alpha 1, Gen II, TR & TRS
Application: Fits Mercury MerCruiser I, R, MR, Alpha One, TR, TRS, and all outboards with Magnetic gear lube fill or vent 3/8-16 UNC threaded screws.
Replaces:
What is the Quicksilver 22-8M0058389 Magnetic Oil Plug Drain Kit used for?
The Quicksilver 22-8M0058389 Magnetic Oil Plug Drain Kit is used with 3/8-16 drain and fill hole screws on specified MerCruiser sterndrives, Mercury and Mariner outboards, except Verado series models. The kit includes the magnetic plug screw version and seal for the lower unit gear lube drain and fill application.
What Mercury and MerCruiser applications does the Quicksilver 22-8M0058389 fit?
The Quicksilver 22-8M0058389 fits Mercury MerCruiser I, R, MR, Alpha One, TR, and TRS applications, as well as all outboards with magnetic gear lube fill or vent screws using 3/8-16 UNC threads. It is listed for all MC-1, Alpha 1, Gen II, TR, and TRS applications.
Why is the seal important when using the Quicksilver 22-8M0058389?
The seal helps the drain and fill hole screw seat properly in the lower unit. According to the product description, using the seal helps retain gear lube in the gear case and keep water from seeping inside, which could cause serious damage.
What is the purpose of the magnetic plug in the Quicksilver 22-8M0058389 kit?
The magnetic plug contains an embedded magnet that attracts ferrous metal shavings. This helps keep those metal particles from remaining suspended in the gear lube where they could contribute to gear damage.
What thread size does the Quicksilver 22-8M0058389 use?
The Quicksilver 22-8M0058389 is used with 3/8-16 drain and fill hole screws and is specified for applications with 3/8-16 UNC threaded gear lube fill or vent screws. Verify the thread specification and application for your lower unit before installation.
What parts does the Quicksilver 22-8M0058389 replace?
The Quicksilver 22-8M0058389 replaces Mercury 22-67892A06, GLM 21731, Mallory 9-72651, Redline RL2375, Pro Marine 64892, and Sierra 18-2375 according to the supplied product information.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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