1/2" Threaded Expansion Tank Service Valve w/ Hose Drain Calefactio
1/2" Threaded Expansion Tank Service Valve w/ Hose Drain Calefactio
1/2" Threaded Expansion Tank Service Valve w/ Hose Drain Calefactio
1/2" Threaded Expansion Tank Service Valve w/ Hose Drain Calefactio
1/2" Threaded Expansion Tank Service Valve w/ Hose Drain
Brand: Calefactio
Part#: HGSV12
In Stock
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$14.45 / each
$55.00 box of 4
($13.75 each)
Orders over $99 ship free
This service valve is 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.

Technical Specifications:
  • 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.
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boiler upgrade
Was having issues with pressure blow off, i had to replace expansion tanks, and the system did not have any service valves or shutoff in good location. used these they worked perfect, easy install.
By Juan (from Bayville, NY) on 03/12/2022
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