Inta/iStop Anti Freeze Valve Zero 28mm (108301)

The Altecnic iStop® anti‑freeze valve (28 mm, part 108301) protects central heating and heat-pump circuits by automatically draining the system when water temperature falls to around 3 °C — closing again at 4 °C. Built from brass with compression connections, it handles up to 10 bar pressure and operates reliably in ambient temperatures from –30 °C to 60 °C.