I recently discovered that one of the three valves going into the skimmer at the pump froze over the winter and needs replacement. I am replacing all three to avoid future problems. My issue is this, the two lines coming from the upper skimmer baskets have water in them, but is not flowing, however, the line from the drain at the bottom of the deep end is forcing water through the line. This makes it difficult to glue pieces together. Is there a way (short of draining my pool) to stop this flow of water so i can glue the replacement valves in place? PLEASE HELP ! ! !