How does a vacuum suction cup work?
Ideally, a suction cup works best against a smooth or non-porous surface.
The cup plate completely seals against atmospheric air when generating a vacuum, and internal air is quickly evacuated.
Therefore it makes a strong suction.
Pump&fix suction cup has a pumping button to get the air out which works like
vacuum generator to make a vacuum interior of the cup.
Why does it fall off, or is not suction working?
Whatever the reason, the suction cup becomes not work when the vacuum is broken due to leakage.
Please refer to the cause and solution.
1) Check if the surface is not ideal such as not smooth, porous, too wavy, etc
2) Check the plate and wall surface if anything is attached disturbing the excellent sealing and clean it up.
3) Use the pump regularly or when the red line is seen to maintain a good vacuum.
As time goes by, outside air slightly could enter the system naturally, so that use pump, center button, to get
it out again for a long time usage without falling off.
4) The adjustable swivel slot could be too tight the very first time.
Please move it down or up several times after inserting the showerheads.
Originally it has very high tension to maintain stopping the position at any angle between 90 to 45.