Gen3 Marine Stainless Steel Water Deck Fill w Key Gen3 Marine Water Deck Fills are constructed of corrosion-resistant 316 stainless steel thats durable and long-lasting. The slotted cap of this deck fill requires a key to open for added security. The cap is connected by an attachment chain so you dont have to worry about dropping or losing the cap while it is removed from the deck fill. Installation hardware is sold separately. Key included. Features Water Deck Fill 316 Stainless Steel construct