If your needs are for a compact single point Liquid Level Switch, The 20-611 Level Switch should be considered. The 20-611 is designed to handle industrial jobs like switching contractors and solenoid valves. 20-611s use the Yaskawa Control Bestach (™) hermetically sealed switch element. Hinged armatures, wrought contacts and a wiping action which make reliable inductive load switching possible. The 20-611 mounts with 1/4 NPT threads, Jam nut and O ring.
Polypropylene version is suitable for water, soaps , light acids.
