Update your trusty plastic cans/jugs today with this set of solid base caps. They screw right onto the can & will secure it for storage & transportation. Keep your liquid pure by preventing dirt & debris from getting inside your can or jug. Coarse thread fits standard gas/diesel/water cans like Scepter, Scepter jerry can, Midwest, Wedco, Briggs, Eagle & SOME metal cans. Cap must be fully tightened on can for proper seal. Includes Buna-N washers which are resistant to various fuels & chemicals. Pack of 4 coarse solid caps. Compatible with SOME metal cans including Midwest, Briggs & others. May be used with Chilton, Craftsman, Anchor, No Spill, F-Style jugs & some racing jugs ONLY with special adapter (available online). Not compatible with most Blitz cans. Please note this is not an exhaustive list & there may be other cans or jugs with irregular mouths that are not compatible or require an adapter.