Single point float user adjustable switch - T/LL122 - Rochester Sensors
Reliable Automatically Adjustable High Sealability Environmentally Friendly Float Switch, Water Tank Float Switch, for Swimming Pools Barrels : Amazon.co.uk: Garden
Bilge Float Switch, Float Switch, Automatically Adjustable Tanks for Barrels Swimming Pools Water Containers : Amazon.co.uk: DIY & Tools
TUBA1NEO5M | ATMI Cable Mount Copolymer Polypropylene Float Switch, Float, 5m Cable, SPDT, 250V ac Max, 125V dc Max | RS
Metabo PS 7500 S 240V 450W Dirty Water Pump with adjustable float switch, at D&M Tools