The air flowrate through a Stockman style of standpipe needs to be adjustable to ensure that a siphon does not form. Here is some simple modifications to a PVC cap and piping to enable easy adjustment of the airflow.
Cap for adjusting air flowrate through a Stockman style standpipe.
Before finally installing the standpipe into the bulkhead fitting, ensure that you can see the holes/slits from the outside of the tank. That will allow easier adjustment of the air flowrate.
Stockman style standpipes installed with adjustable air flowrate cap.
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