Rule Float Switch A-Matic. Rule Industries Rule-A-Matic Float Switch with 12-24 VDC offers outstanding performance. Rule uses extra-large float chambers for increased buoyancy and detachable mounting bases that make them easier to install and remove for cleaning and inspection. All models are suitable for pumps that draw up to 20A except the Model 35 Rule-A-Matic which is suitable up to 14A. Year after year the Rule-A-Matic Float Switch has been the switch of choice for boaters around the world. Rule Industries latest design now includes a removable base for easy cleaning and servicing a mercury-free snap-switch tested to over one million cycles and marine-grade blocked wire. Specifications for Rule A-Matic Float Switch: Manufacturer: Rule Color: Black Voltage: 36 volts 24 volts 12 volts Features of Rule A-Matic Float Switch Volts: 12 24 36v Package Contents: Rule A-Matic Float Switch Rule 35A: Float Switch A-Matic