The HGSV12 from Calefactio is a 1/2” Threaded Expansion Tank Service Valve w/ Hose Drain. It's compatible with all non-potable expansion tanks, including Calefactio HGT series, Amtrol Extrol & Radiant Extrol series, B&G HFT series, Watts EXT series and others. It is designed to simplify expansion tank replacement/re-charging and filling/draining the system. HGSV12 is a simpler version of the Webstone 41672 valve and does not have the supply line connection.
- Inlet (bottom - expansion tank) connection: 1/2" female threaded;
- Outlet (top - system) connection: 1/2" male threaded;
- Side outlet: 3/4" garden hose type thread with cap;
- Ball valve type: 1/4-turn;
- Not for potable water use.