Don’t let a leaky drain plug ruin your boating day! This set includes 6 rubber-coated stainless steel seal washers designed for Mariner outboard gearcases. Fits 3/8-16 drain, oil, and vent screw holes. Essential for preventing gear oil leaks and water intrusion. Washers are single-use—replace each time you change gearcase oil. High-quality materials ensure a tight seal. Protects your engine from costly damage. Easy to install, just make sure the washer is seated properly before tightening. Compatible with MerCruiser stern drives too. Always check part number 26-830749 for compatibility. Keep your outboard running smoothly with these reliable, durable seals. A small part with a big job—don’t skip it during maintenance. Perfect for DIY marine repairs or professional use.