As you install the DCSS pumps, make sure they are installed at the proper depth. Too high or too low and you could starve the pumps. Fortunately it's easy to measure the space between the mounting ring and the lower ring on the pump, where you want a 3/8-inch space. A short length of hose joins the pumps to the hat. As you are sliding the pumps into place be sure that the clamps are already on the hose. It requires some elbow grease to push them in, so you don't want to do it twice. With the pump's outlet port in the hose, you can tighten the clamps.