I purchased it but never used it.

This PERKO Locking Gas Cap Boat Gasoline Deck Fill with Lock Cover & Lockable Key is the perfect addition to your boat. Made by a trusted brand, this gas cap is designed to keep your gasoline secure and prevent spills. The cap is made in the United States and comes with a manufacturer part number of 1313.

The cap is easy to install and features a lockable key for added security. It is a great choice for those who want to keep their gasoline safe and secure while out on the water. This item is a must-have for any boat owner and is sure to provide peace of mind while out on the water.