PA-E RO-122 small Reverse Osmosis Water storage pressure tank Manufactured using FDA-compliant materials Imported best pressure tank on the market, designed to last 5+ years NSF and CE certified tank FDA approved bladder, food grade, no rubber smell, no plastic smell, stainless steel connection on top 3 gallons outside volume, holds 2 gallons of water tank only ( tank valve is not included) pre-charge at about 5-7 psi