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The Regulus anti freeze valve 21965 is a thermostatic frost protection valve with factory-fitted insulation, DN25 with a 1" female connection. It opens automatically at 3°C to discharge water before it can freeze, protecting outdoor and exposed pipework, heat pump connections and solar circuits without needing any power supply.
The antifreeze valve X0001 is a 1" self-acting frost protection valve in CW617N brass. When water in the pipe drops to 3°C the cartridge opens and drains it away, closing again at 4°C. Rated PN10 with stainless steel 304 spring and EPDM seals, it needs no power supply and works down to -30°C ambient.
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