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Old 07-25-2008, 03:10 AM
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Arnold40 Arnold40 is offline
Master RB in the making
 
Join Date: Jul 2007
Location: Clifton Park, New York
Posts: 131
Tank Size (US GAL): 45
Experience: 2 Years
Name: Arnold
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Arnold40 is looking at reefs
Default Re: Return Pipe Noise

The hole is an anti-siphon. Do you have a check valve in the return line? If you don't have a check valve install one and plug the hole or replace the elbow.
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