Shoreline Marine Deck and Baitwell Plugs are stainless steel plates with adjustable brass cam snap. They provide a tight, leak-proof seal in most drains.
Shoreline Marine Deck & Baitwell Plugs 5/8in Brass 1 Pair:

• Stainless steel plates with adjustable brass cam snap.
• Provides a tight, leak-proof seal in most drains.
• Pack contains two ⅝” (16 mm) plugs
• Snaps and locks to form a dependable waterproof seal
• Body made from flexible and watertight rubber
• Ideal for water tanks, bait wells, drain tubes, and more
• Quick and simple installation and removal