You won't find a PVC fitting to fit the bilkhead threads. You need to glue pipe on the inside and go from there.
And your retaining nut is upside down.
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220 in-wall reef, 10 clown pairs, 4 fry tanks, 18 grow-out tanks
Current Tank Info: 220 in-wall reef, clownfish breeding/growout system, 20L coral QT and 29 fish QT
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