2 screw collar caps (fine and coarse threads - both collars have an inside dimension of 1 3/4") to use on most of the cans. Please check your container outside thread diameter before you place an order. One of the great ways to transform your old gas cans with a new touch. There's no reason to put away the rusty cans when you have a 5 Gallon Gas Can Nozzle Replacement from Kool Products.