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, ... -balanced, feel smooth, no smell, no blowout, leakage-proof 4.Applicable to within five gallons of bottled water (mineral ... one, four-in-one, recycle or one-way,with inner foam and heat sticker or not,you could choose ...