Buy online replacement filters or any parts needed for PA-E Reverse Osmosis-RO-122 storage tank fits with all ro systems, under sink in our online store - This pa-e reverse osmosis ro-122 is a 2.2 Gallon slim size space saver metal tank and it's one of the original parts we carry for this systems, It's stainless steel 1/4" connector powder coated steel exterior enclosed reservoir Is Polypropylene/butyl rubber plastic tank stand included 3.2 Gallons volume @ 40 psi 2.2 Gallons connector 1/4" male pipe thread tank material steel tank pre-Charge 7 psi max working Pressure 100 psi certifications NSF 58 certified.Weight 8 lb