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yep 2 's stink
as for the duck an head problem, well put a cap over it when not draining.
I had the 4 ich drains where they turned up threw the concrete with a elbow to T fitting, now take a section of pipe just longer than the water depth and stick in in, NO GLUE!!! Now on the top, glue on a cap..once filled you can find the water level line on it and drill a row of 1/2 inch or so holes around it. This will act as a n overflow when it rains, or if you do like I did and just let freash water run into them all the time.
On drain day, just grab the pipe section and pull it out, they wont go down the hole, LOL
CLEAN IT, PLUG IT BACK AND FILL IT UP.
With the 4 inch, now you can wash all the much right down the drain instead of having to get it out by hand and shovel