Be warned if water level goes up or down out of tolerance! This low cost float switch features: High reliability, Sealed reed switch provides high isolation when pump wiring breaks down, Will operate totally submerged, unique reversible float allows for N.O. or N.C. switch circuit, fits virtually all sizes and types of return pipes. UL Listed at 1 AMP MAX at 24 VDC (recommended at <250mA). Comes complete with stainless steel hose clamp and 20 lead wire.