Check valve - a type of protective pipe fittings designed to prevent a change in the direction of flow of the medium in the technological system. I also once had a problem with him and I had to completely change it. I was helped by the water supply team from Mississauga Plumbing Services with the help of french drain and they are doing an excellent job for which I am very grateful to them. The workshop is worthy of reward. I didn’t even think that replacing such an insignificant detail could affect my housing as a whole and all thanks to these employees. There would be more such people!