There are two screws in front of this one, and we’ll take them off:
Put the two screws on the back a little loose, and after loosening them we can take them out:
Take it to one side, and we can see the air filter cotton below:
Then we remove the four screws around the air filter cotton:
We’ve taken it down, we’ve taken it off, and we’ve thrown it away：
Then we replace a new filter cotton, the filter cotton on the four holes and the above four holes one by one correspondence:
Then install it:
After installing the filter cotton, we restore the pressure pump to its original position and install the first two screws:
The front two screws are installed, and the back screws only need to be tightened a little.
