Gaggia La Precisa EL1 Uso Y Mantenimiento página 64

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5.4 Installing the water and steam
knobs
Take the provided knobs out of the accessory box.
Before inserting each knob on the valves, check that the
knob seats match the ribbed coupling on the valve
opening/closing system.
Insert the knob by pressing on the valve ribbed coupling
until you hear a strong click sound. This is the signal of the
end of stroke and correct insertion in its seat.
After inserting the knobs, turn them in both directions to
check for their correct valve opening and closing
operation.
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