Duda Energy ExpTank-036V-PW 36 L/9.5 gallon Blue Expansion Tank for Wells & Domestic Hot Water Supply Tank Thermal Pressure Protection Capacity: 36 liter/9.5 gallon connection: 3/4 inch NPT pre-charge pressure: 2 bar/29 psi Membrane Type: EPDM (made in Italy), max fluid temperature: 99c (210f) Color: blue, max pressure: 10 bar (145 psi), tank material: deep draw cold steel Membrane certifications: NSF51, hygienic certified, approved by EU and USA institutions Flange & connections material: St37, galvanized Carbon steel