I seem to have an overly simple pool plumbing system compared to most i have looked at. I only have 1 pipe from the pool to the pump; apparently the skimmers and main drain lines are connected under the slab. There are no valves on either side of the pump. This makes it a pain to clean the pump's leaf trap - when I remove the cover, all the water drains from the pump, which makes it impossible to prime without a lot of air getting in. I am now upgrading the pump (to a maxflo vs) and would like to install valves to eliminate this problem. I am thinking of putting in jandy valves on either side of the pum, but maybe I really only need on on the suction side? Any advice would be much appreciated.