Hydroflow
The Hydroflow auto top-up kit: a float valve that keeps a reservoir topped up from a mains supply or a header tank, so a system never runs dry while you're away.
In StockHydroflow
£17.96
About Hydroflow
Using it
Fit the valve in the tank at the fill level and connect the supply; it opens as the level drops and shuts when full. Pair with a water filter so the top-up water is clean.
Related
Fittings and water filters are under Systems & Irrigation.