ARB RD117 - Manual (Page 31)

4 Installing the Air System
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To attach the air line to the push-in fitting of the solenoid; insert the
line firmly into the fitting, pull outward on the flange of the fitting
while holding the line as far into the fitting as possible, and then
gently pull outward on the air line to clamp the line in place.
4.3 Connection to the Bulkhead Fitting
In the case of an IFS axle assembly or in the case that the axle
assembly has been completely removed from the vehicle, the
assembly will have to be remounted in order to position the
bulkhead fitting in its correct location for air line access.
Trim the air line to length using a sharp knife.
Insert the support spring over the end of the air line - small end first.
(Fig.18.)
Insert the outer compression nut over the air line.
Insert the 5mm [0.197”] ferrule over the end of the air line. Leave
approx. 5mm of tubing between the ferrule and the end of the tube.
Figure 18.
Insert the support tube all the way into the end of the air line.