THERMAL EXPNSN TANK 4.5G *Brand Name: Eastman *Capacity: 4-1/2 gal *Product Type: Pre-Charged Expansion Water Tank *Packaging Type: Boxed *Material: Steel *Connection Type: MPT *Connection Size: 3/4 in. *Lining Material: Butyl Rubber *3/4'MIP connection *304 Stainless Steel system connection *Butyl rubber diaphragm *Factory charged at 40 PSI *Max operatingtemperature 210 degrees F *Max working pressure 150 PSI