Manual opener for valve operation on power failure; valve returns to automatic position when power is restored. May be installed without disassembling the valve.
Honeywell Honeywell
$90.78 – $238.79 (as of August 20, 2019, 5:35 pm)
Can expand up to 16 zones with AQ255 or AQ257 or up to 64 zones with AQ254 Add-A-Temp panels
Use with AQ1000 two-wire communicating thermostats, or most dry contact digital thermostats
Offers zoning control for up to four zones and controls up to two stages of heat from a single thermostat