Quote:
Originally Posted by sdeikenberry
Those do work, but you have to stop the backflow into the HVAC drain pan so that all the water's force goes out the drain line. To do that effectively you need a valve in the pipe between the hook up of the hose and the HVAC drainpan.
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I guess that depends on the arrangement of the piping. On my unit, the rubber part of the device extends a few inches into the vertical exit part of the drain pipe. It seals off the horizontal drain connection from the AC unit. There is no way for any backflow to occur. The water can only go directly into the drain pipe and to the outside of the house.
On most units I have seen, there are 3 pipe connections above the vertical exit pipe. None of those 3 joints are glued together, so you can easily remove any part of the drain assembly to add water or to flush the system.