Does bulkhead size matter?

[Bloodasp]

not really. kind of similar to your sink, bathtub or toilet, when water drains you sometimes hear a gurgling noise, which is sometimes pretty loud. same thing happens when water drains from your main tank to your sump.

[mark]

large bulkhead for you drain since just gravity whereas the return is under pressure so can use the smaller.

A open drain will cause noise. Since you only have the single drain, look into the Durso, Stockman or Hofer to help quiet.

[tHeHEYzeus]

Thanks Mark that was very helpful!