This superb pneumatic control from Markon is unique in that it has no pneumatic bellows. Quite simply it operates on the same priniciple of a bicycle pump! it is a small control and only requires a 1 1/4" hole through bath or mounting surface. This control has an output spigot which can adapt to either 0.125" (one eigth) or 0.062" (one sixteenth) internal diameter air tube.
Mounting Hole: 32mm
Air pipe connection (inside): 20mm
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