i use the quad manifold model from general hydroponics,but i use about 5 of these ones called aqua culture from wall mart they kick ass and are pretty quite. they have 2 outlets a piece,verry powerfull,and are about 9 dollers.my gh pump is pretty loud and doesnt move a lot of air at all u would think for spending 75 bucks on a pump it would out do a wall mart fish tank pump