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The tap adopter is fixed in the tap as shown in figure.
The second figure shows one end of the inlet hose..
The outer portion I've shown in blue colour only for understanding purpose. The actual colour may be different.
The Outer portion(blue) is movable up and down.
While fixing,
1.Press down the outer portion.
2.Keeping in the pressed down position, Insert into tap adopter.
3. Now, Leave. If it doesn't go back automatically, slightly push upwards.
While removing
1. Press down the outer portion.
2.Keeping in the pressed down position pull it.
As same as connecting the gas regulator into the cylinder.