ARB RD138 - Manual (Page 20)

3 Installing the Air Locker
18
NOTE : Use an automotive brake line tubing cutter to cut the
seal housing tube, never a hacksaw as this will leave
metal filings in the air system.
Figure 13.
c From the inside of the housing, insert the trimmed tube into the
bulkhead.
c From the outside of the housing, assemble the small O-ring over
the top of the short length of seal housing tube protruding through
the bulkhead fitting.
c While holding the seal housing tube into the bulkhead fitting, insert
the small drilled end of the center compression nut over the
extended tube as shown in the assembly diagram (Fig.14.), and
screw it into the bulkhead body, and lightly tighten.
NOTE : Be sure to insert the correct end of the center
compression nut into the bulkhead body. The thread
has been partially relieved on the bulkhead side of the
center compression nut to visually identify its
orientation. (Fig.14.)