Checking the valve (Focus 2)

Check the valve in the following order:

- unscrew the valve cap;

– apply liquid to the valve so that it fills the cavity of the valve;

– when a bubble forms, tighten the valve core with the back of the cap;

– recheck the valve in the specified manner; if bubbles continue to form and if it is impossible to tighten the valve, replace the valve;

– screw the cap onto the valve.