Just moved into a new house with a jet tub, trying to figure out what this weird knob is : r/whatisthisthing
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2540-281 Air Control with Knob, J-200 (2007+)
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Amazon.com: Hot Tub Classic Parts Spa Air Control Knob Compatible with Most Jacuzzi Spas Silver Color 2540-203 : Patio, Lawn & Garden
JACUZZI® Air Control Knob in Silver 945
