Also there are two different style posts that use the plastic spacers. Some posts take the plastic spacers without issue, the other type need about 3/16-1/4" cut off the bottom of the spacer since they don't manufature the short spacer anymore. You acutually can remove the plastic dip tube all together. The plastic spacer is what actually does the sealing, unlike other kegs that need the dip tube/o ring combo to seal.