4Pcs Lower Unit Oil Drain Plug, Magnetic & Non-Magnetic Gear Case Screws with Gaskets for Mercury MerCruiser Outboard Engine Replaces 79953Q04 & 8M0058389

Features:----These marine lower unit oil mercury drain plug are crafted from premium-grade 304 stainless steel and high-density rubber gaskets.----It is also suitable as a practical gift for boating hobbyists who value proactive equipment care.----The NdFeB magnetic alloy embedded in select plugs actively attracts ferrous particles suspended in the gear oil, extending component life and reducing maintenance frequency.Specifications:Material:304 stainless steel and rubberColor: As pictures shownSize: As pictures shownPackage Includes:4 x Lower Unit Oil Drain Plug

• 【Premium Material】These marine lower unit oil mercury drain plug are crafted from premium-grade 304 stainless steel and high-density rubber gaskets. The stainless steel construction ensures saltwater corrosion and mechanical wear, while the rubber seals provide a reliable barrier against water intrusion into the gear case. This combination delivers long-term durability and consistent performance in harsh marine environments.
• 【Features】Each kit includes both magnetic and non-magnetic screws designed to capture metal debris during operation, preventing internal damage to gears and bearings. The NdFeB magnetic alloy embedded in select plugs actively attracts ferrous particles suspended in the gear oil, extending component life and reducing maintenance frequency. The precision CNC-milled threads ensure a secure fit without stripping.
• 【Easy To Use】Remove old plugs carefully to avoid damaging the housing threads; clean the seating surface thoroughly before inserting new plugs with fresh gaskets. Tighten to manufacturer-recommended torque specifications using a calibrated wrench — over-tightening may crack the seal or strip threads. After refilling with appropriate lower unit gear oil, run the engine briefly at idle to check for leaks around the plug area before full operation.
• 【Wide Applications】Compatible with most Mercury, Mariner, and MerCruiser outboard motors and stern drives (excluding Verado series), this kit serves boat owners, marine technicians, and DIY enthusiasts performing routine gear oil changes or preventative maintenance. It is also suitable as a practical gift for boating hobbyists who value proactive equipment care. These plugs help maintain optimal drivetrain health across diverse recreational and commercial vessels operating.
• 【What You Will Get】You will receive 4 pieces total: 2 magnetic screws (0.55 x 0.67 inches) and 2 non-magnetic screws (0.55 x 0.35 inches), each paired with a yellow rubber sealing washer. All components are packaged together for easy identification and storage. If you have any questions about our products during use, please let us know and we will solve the problem for you as soon as possible. We sincerely hope to bring you a pleasant experience.