My Drain is Too Loud

[AndyL]

You may want to do a quick google search on the durso standpipe, stockman standpipe or hoffer gurgle buster. Basically fancy plumbing on the intake the reduce the noise.

My personal preference, is if there are 2 holes/bulkheads, put a simple stand pipe in one (emergency overflow) then add a ball valve to the second, reducing the flow so that the water level stays steady (and completely covering) the drain - no noise at all.