Zurn XT-18 4.5 Gallon Expansion Tank, 3/4 In. MNPT

Zurn 112-950xlt2 1-1/2 in. Fnpt x fnpt double check valve assembly - 175 psi - lead-free cast bronze designed for installation on potable water lines to protect against both backsiphonage and backpressure of polluted water into the potable water supply. A test cock plug is provided to protectagainst fouling caused by insects, dirt and debris. Assembly shall provide protection where a potential non-health hazard exists. standards compliance unless otherwise noted, applies to 3/4" thru 2" horizontal asse listed 1015 (vertical flow-up:1 1/4" thru 2") iapmo listed csa certified (vertical flow-up:1 1/2" & 2") awwa compliant c510 approved by the foundation for cross connection control and hydraulic research at the university of southern california nsf listed - standard 61, annex g certified to nsf/ansi 372 by iapmo rt