This electrical converter starter pack is perfect for the restoration professional and professional carpet cleaner. This assortment consist of four pieces. Temporary power distribution box Construction spider box The main unit plugs into your standard electrical dryer outlet in the utility room of most homes. This 3 prong 30 amp 220 volt head also fits commercial coffee machine plugs and water heater outlets of most building built before 1997. This converter box takes the 220 volt power and gives you two separate 25 amp breakers with two 20 amp 120 volt Ground Fault Interruption protection. 220 volt 30 amp 3 prong to 2 gang GFCI with breakers This converter will operate 4 large dehumidifiers or 4 air movers at the same time. For portable carpet cleaning equipment that needs two circuit breakers, this is your easy answer to not have to worry about tripping breakers or blowing fuses. This converter has a proven reputation for over 20 years. This 4 pack kit also comes with the adaptor heads to allow you to plug into stoves, ovens, mobile homes, and many other locations.