theres one powerhead for each U tube of course and for one of them it is a Maxijet 1200 with the venturi adapter installed , note on that model it is important to keep the venturi clear of debri using a pick of some sort, that venturi does tend to get a build up in it causing performance issues. the other powerhead I believe its a Rio model ?? Iam not sure the unit has encrusted over with sea life but it tends to work much better than the maxijet pump.