O-ring lubricant

Pool stores carry a lubricant specifically for it but if your sucking air that much, it probably is mis-seated in the groove or it needs replacing (perhaps even both). A thorough visual inspection will probable reveal to you what the issue is.
 
Welcome to TFP!!

Though vassoline was mentioned - PLEASE DON'T EVER USE IT ON YOUR POOL GASKETS! :hammer:

Like any petroleum based product, it will RUIN the gaskets!! :(

Again, welcome here, I know we'll be able to let you properly care for your pool, less expensively :cool:
 
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