Gamma Seal Lid Every barn has at least one five-gallon pail lying around that used to contain feed, paint, detergent, and more. Why throw away a perfectly good bucket when you can turn it into genuine useable storage? The Gamma Seal lid permanently transforms your 12-inch diameter bucket into an airtight/leak proof storage container. Now a bucket can be put to good use for any number of storage applications. Simply snap the patented adapter onto your bucket, spin on the removable lid, and that's it. Specially engineered gaskets ensure that the lid and adapter are properly sealed to guarantee airtight protection. One quick spin and it's open, and closes air/watertight in seconds. Fits virtually any 3.5-7.0 gallon bucket (including 20 liter).