Atlantic Water Gardens Bottom Drain Kit for Pro Series Skimmers pond fountain The circuit breaker turns off power Select De Icer Model:4400D 1HP De icer The circuit breaker turns off power in case of overload or power surge Please note that the antiquing process on each product can create a darker or lighter finish than what is shown A Bottom Drain Kit can help to reduce sludge and debris in your pond by pulling debris from the bottom of the pond while the Super Flow weir door skims debris from the surface A Bottom Drain Kit in your Skimmer makes it easy to keep sludge at bay by pulling debris from the bottom of your pond while the Super Flow weir door skims debris from the surface