A dime-size leak can keep a 400-horse Verado tied to the dock—but swapping in Mercury’s Oil Drain Gasket 26-888593 keeps your oil exactly where it belongs. This genuine factory seal slips over the drain-tube plug on every inline-four and inline-six Verado (as well as Pro and Racing variants), locking in pressure and stopping the slow, tell-tale weep that forms around the cowling vents.

Why this 0.75-inch washer matters

• Exact OEM geometry—0.75″ OD, 0.13″ thick, and feather-light at 0.01 lb; no trimming, stretching, or second-guessing torque specs.

• Fuel- and heat-resistant composite stands up to 250 °F oil changes and winter lay-ups without hardening.

• Crush-fit sealing ridge distributes load evenly along the drain flange, eliminating drips and stray vacuum leaks.

• One-time use, five-minute job—spin the plug, drop the new gasket, torque to spec, done.

Whether you’re mid-season on a 135-hp bay boat or winterizing a supercharged 400R, this tiny seal keeps your bilge clean, your oil analysis honest, and your Mercury warranty intact. Toss a couple in the tackle tray—because a two-dollar gasket is cheaper than a quart of spilled 25W-50.