390004 is the lid O-Ring for the American Products Power Pump Pump Models.
If a pump is sucking air, spitting air back to the pool thru the inlets, an air leak is causing the problem. This can result in equipment damage, less chemical efficiency,less efficient filtration, and other problems. The first thing to check is the pump's lid O-Ring for small crackage. If the O-Ring is swollen or exhibits cracks, then the O-Ring should be replaced and can be the reason or part of the reason for air leakage.
The gasket is constructed by SSC to the manufacture's specifications.
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