I recently bought a house with a pool. I am a newbie to pools and pool maintenance. I recently noticed that the wall fitting on the pool cleaner had a crack in it. I went to the local pool supply store and bought a replacement made by polaris. When I install the polaris one, the pressure relief valve is open. I don't understand if the problem is with the polaris wall fitting or i have the wrong kind, or I did not install it correctly. Also, there are 2 (red and blue) discs that came with the polaris wall fitting and I have no idea what to do with them. Any help is much appreciated.