AO Smith® Expansion Tank, Series: TW Series, 2 gal Tank Volume, Acceptance Volume: 1.03 gal, 150 psig, ASME Yes/No: No, 7.9 in Dia, 11 in Height, 200 deg F Maximum Temperature, MNPT, 3/4 in, Baked Epoxy-Polye

State Industries Expansion Tank, Series: TW Series, 2 gal Tank Volume, Acceptance Volume: 1.03 gal, 150 psig, ASME Yes/No: No, 7.9 in Dia, 11 in Height, 200 deg F Maximum Temperature, MNPT, 3/4 in, Baked Epoxy-Polyester More Info: Many of today's water systems require backflow prevention. This seals off the system and requires the use of an expansion tank or the relief valve can discharge on every heating cycle. TW Series tanks eliminate wasting water and provide a smooth operating system and assure long trouble-free service.