Hoffman Specialty Model 79 3/4" Male x 1/2" Female NPT Water Main Vent Valve for Hydronic Heating and Cooling Applications - 401488

The built-in Check ValveA valve that prevents backflow of water into the sump pit from the Discharge Pipe . is a unique feature of Hoffman Specialty air vents, which assures the air you want to eliminate from the system does not get back in when system pressures fall.Brass and stainless steel construction of Hoffman Specialty air vents assures long life in glycol environments, with no chance of material breakdown.Vents up to 850 SCIM. The only vent in this category with published ratings.Seat and Check ValveA valve that prevents backflow of water into the sump pit from the Discharge Pipe . are above the shell, isolated from suspended dirt in the system. Removable seat and Check ValveA valve that prevents backflow of water into the sump pit from the Discharge Pipe . assembly allows quick cleaning or replacement.Equipped with a 1/8" NPT thread, allowing connection of a piped drain where any water leakage is unacceptable.Supplied with both 1/2" female and 3/4" male NPT connections for great flexibility in application and installationHoffman Specialty Vents come with one feature unmatched by any other supplier, your local Bell & Gossett Representative. Your representative can provide the assistance to make certain your entire system will perform as expected.To be used for systems with maximum operating pressures up to 75 psi .tooltip { cursor: pointer; text-decoration: underline; position: relative; } .tooltiptext { visibility: hidden; width: 220px; background-color: #333; color: #fff; text-align: center; border-radius: 5px; padding: 8px; font-size: 14px; position: absolute; z-index: 1; bottom: 125%; left: 50%; margin-left: -110px; opacity: 0; transition: opacity 0.3s; white-space: normal; line-height: 1.4; } .tooltip:hover .tooltiptext { visibility: visible; opacity: 1; }