5 gallon water bottle cap with inner foam Blue or white Diamater:56mm,complies with ... 1. 5 gallon water bottle cap(two pieces) with inner foam 2.Blue or white, PE new plastic material, ... pure water, spring water, magnetized water etc drinking water) packaging use. 5.We supply different kinds of 5 gallon caps ... one, four-in-one, recycle or one-way,with inner foam and heat sticker or not,you could choose ...