The SSF211 Float Switch series is a horizontally mounted switch that is fitted internally in the side of the tank, so requires access to the inside of the tank. The switch is manufactured in 304 & 316 grade Stainless Steel and will work in liquids of SG 0.8 minimum. The switch action may be reversed by mounting the device with the float able to move upwards away from the body, instead of the more normal downwards direction