This picture shows a common valve setting for this pool. The yellow "T" lines placed over each valve show the position of the valve handles. If the handle is placed so that the top of the "T" is across a pipe, that port is closed - as is the case for the pool cleaner and the spa drain. If the handle is placed with the top of the "T" running in line with the pipe, all ports are open. If the "T" is at an angle to the pipe, the valve is allowing partial flow through the port - as is the case with the pool drain. In this particular valve configuration water is flowing to the pump from the two skimmers and partially from the pool drain. Water from the spa drain and the pool cleaner is blocked. When the suction cleaner is used, the skimmer ports are shut off to provide more suction to the cleaner.