Koller Combination on/off pneumatic button with air regulator and integrated check valve. This button is very similar to those used by B & Q on some of their whirlpool baths.
The usual reason for failure of this button is that the pneumatic bellows has perished and is not switching the whirlpool system off. Where the control is easily accessible, replacing the whole control is easy. However, if the control is unaccessible, it is possible to unassembled the control and simply replace the on/off cartridge. This is particularly useful when the control is on the far side of the bath or the bath panel is difficult to remove.
Also available in gold.
Mounting Hole: 42mm
Air pipe connection (inside): 20mm
Air pipe connection (outside): 26mm
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