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Amazon.com : Bestway SaluSpa San Francisco HydroJet Pro Inflatable Hot Tub Spa | Large, Square Portable Hot Tub with Cover | Features Filtered Heated Water System and 180 Jets | Fits 5-7
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What is this knob at the top of my inflatable hot tub? It is not under the water when no one is in the tub. The hot tub is a Bestway SaluSpa
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Amazon.com : Coleman SaluSpa Inflatable Hot Tub Spa | Portable Hot Tub with Heated Water System and 140 Bubble Jets | Fits Up to 4 People : Patio, Lawn & Garden
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