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Series PTA expansion tanks are ASME-rated, pre-charged diaphragm-type vessels designed to absorb the forces of expanding water and protect a potable water system from pressure build-up.
Bell & Gossett PTA Series 1BN346LF Diaphragm Expansion Tank, 3.5 gal Capacity, 3/4 in, NPTF, Carbon Steel, 150 psi