"I fitted one of these and when I opened the valve to bleed any air in the line The ball in side shot across the room and water gushed after it !! Had to race to the stop valve to stop the water pouring out. I have been a plumber for over 30yrs and never had this happen. Avoid like the plague. I should be able to give this product zero stars but forced to give it one. One too many me thinks."