Good afternoon all! I am helping a friend troubleshoot an issue with there Multi valve and knew i could get some good answers here! When the pump is on the valve is leaking on the top. I can not see what the pressure is as the gauge does not work, so i know i will have to replace the gauge. Also, when the pump is turned off it sounds like air is getting sucked back at the same place the water is coming out with the pump on. Is there maybe an O ring or some other type of seals that can be replaced? Thanks!