Air valve and knob for the Celebrity C-78 and C-84 hot tub. Also used in Sunrise (and other) hot tubs.

R3035164 4525184, Handle (knob), S-Style, DSG, fits Sure Grip Mounting system (alternative part number #662-2169-DSG)

R3035160 4525155, Air Control, Sure Grip Mounting System (SGMS) and TT Cap (alternative part number #668-0009LH-TT)