The package contains two different suction hose muffs: The black suction hose muff that comes with the package should be used when the inlet valves are of older model without the slots required by the click-muff. In this case, the grey click muff is removed, and it is replaced with the black suction hose muff.
In case you aren't sure which hose is the right model, call us at
Tel: +358 50 552 5366/Toni Veijalainen