Geez - sorry I ruffled feathers on this topic. I was trying to get an authoritative answer to the "standpipe" question where sump reed valves are concerned...and instead, I got remarks on the extremes. So, let me try again by putting the question differently: Has anyone measured the distance from the base (gasket surface) of these reed sump plugs to the top of the standpipe? It seems very likely that measurement would be optimal for proper function.