Okay, I have some pics for y'all. You've seen, if you looked at the link posted earlier, the Modified Durso with the stand pipe where prongs are cut to stick up and hold the cap in position. Here is another variation.
Water rolls down a stand pipe; a 1" Class 200 PVC which extends 1/4" into the 2" ABS Cap above.
A 1.5" ABS Cap could have been used to conserve space if required. Class 200 PVC Pipe has a larger inside diameter which allows more water flow.
The Cap was drilled on each side and secured with a Zip Tie around the center brace. In case you're wondering, the entire tank frame was painted white to match the white stand.
The holes for the Zip Tie did not let enough air through so a separate hole was drilled in one side and then another hole on the other side was drilled to let enough air into the Cap to make the drain absolutely silent.
Initially I was dismayed by the fact that this used 30 gal breeder tank had been drilled in the bottom back center, straight below the brace, but I relaxed when I realized this allowed the cap to be
positioned perfectly. 
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SFReef wrote:
