W&H assistina MB-300 Instructions For Use Manual page 43

Maintenance – replacing the air filter
Switch off the central air supply before replacing the air filter.
> Replace the air filter whenever it is dirty or at least 1x per year.
> Only use clean, filtered compressed air.
(b)
(a)
Press the ring downwards. At

the same time, pull out the air
connection hose.
Open the union nuts (a, b) by

screwing them anti-clockwise
and pull them off.
(a)
Replace the air filter and

(b)
union nuts (a, b).
Screw on the union nuts (a, b)
(a) 
(b)
by screwing them clockwise.
Connect the air connection
hose.
43