ARB RD153 - Manual (Page 29)

4 Installing the Air System
27
NOTE : To remove the air line from the push-in fitting; pull
outward on the flange of the fitting, push the air line
as far into the fitting as possible and hold, push
inward on the flange, and then pull the air line free of
the fitting.
4.3
Connection to the Bulkhead Fitting
F Trim the air line to length using a sharp knife.
F Insert the support spring over the end of the air line - small end first.
(Fig.16.)
F Insert the outer compression nut over the air line.
F Push the airline onto the barb on the center compression nut,
ensuring that it is pushed all the way to the end.
Figure 16.