The Series FSW2 free-floating level switch is mercury-free, self-counter-weighted, and designed for automation of pumps, specifically filling and draining of tanks, wells and reservoirs. The polypropylene double airtight chamber has high-pressure, melted-polypropylene, re-injection sealing to ensure a perfect seal against infiltration. It is CE-approved. Contact factory for piggyback plug option and cable length options ranging from 10 ft to 70 ft (3.04 m to 21.34 m).