Keep Water out of your pedestal base Seals pedestal base when seat is out. For 1.77 Inch Bases Slide pin for easy removal Molded material won't rust or corrode.• Used To: Seal Pedestal Base When Seat Is Removed• Type: Slide Pin• Base Diameter: 1.77 Inch• Finish: Matte• Color: Black• Material: Plastic• Quantity: Single Slide Pin For Easy Removal Molded Material Wonât Rust Or Corrode | Supplies Boat Console Seat Mount Plug