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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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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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Bestway SaluSpa Fiji 4 Person 120 Air Jet 177 gal. Inflatable Hot Tub, Gray, 104ºF Max Temperature - Walmart.com
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