NSF certificated NSF certificated 2.8 gallon plastic tank. Inlet and Outlet Top : Stainless steel 1/4″ NPT1/4″ thread for tank ball valve. Bottom : check / charge / release pressure point. Dimension Smart size ,special for little cabinet. Store less pure water, ensure you drink pure water. Specification: Shelf life: 3 Years. Service life :5 Years min. Pre-charge pressure (empty tank) :5-7 psi. More valuable information: Question : Where can we use this tank? Answer : It is special used as storage tank for Reverse Osmosis System. Question : What is dimension of 2.8 Gallon tank? Answer :please leave space 9.6″x9.6″x14.6″ for the tank. Question : What is in the box? Answer :Just 1 x 2.8 gallon tank in the box,you should buy tank ball valve separated. Question : Where can I buy tank ball valve? Answer :Please search product in our store or contact the seller. It is for 3/8″ tube . Question : BPA free? Answer :Yes, BPA free. Note: 1.It Is Recommended to Wait Until the Entire System Is Pressurized and Re-Check for Any Leaks Before Leaving Installation Site. 2.The First 2 Tanks of Water Produced Should Not Be Used