1、Application: This is a precise seal for the gearcase drain, oil and vent screws. Replacement for Mariner outboards and replacement for MerCruiser stern drives with 3/8‑16 gearcases drain and fill screw holes. 2、OE Number: The replacing part number for reference is 26‑830749, please double check the part number of your item before purchasing. 3、Importance of Washer: When reinstalling the drain screw, be sure to double check to make sure the washer is secured. Without washer, water could seep into the gearcase and cause catastrophic damage to the gearcase. 4、Premium Material: Drain plug seal washers of the outboard lower unit and vent plugs are made of high quality stainless steel and coated with rubber to prevent gear oil leakage. 5、Disposable Washer: The washer needs to change every time the gearcase oil is changed and it is designed to crush under torsion so it is a one time use washer. Item Type: Drain Plug Seal Washer Material: Rubber + Stainless Steel OE: 26-830749 Quantity: 6pcs / set Usage: For use on the 3/8-16 drain or fill screw holes in outboard and stern drive gearcases. 6 x Drain Plug Seal Washer