ARB RD131 - Manual (Page 21)

4 Installing the Air Locker
19
Remove the cover plate.
Using an automotive brake line tubing cutter, trim the tube at the
position marked.
NOTE : Never use a hacksaw for trimming the copper tube as
this will leave metal filings in the air system.
Reinstall the differential cover onto the differential housing by firstly
inserting the free end of the seal housing tube through the bulkhead
port from the inside. No gasket sealant or gasket is required at this
time.
Install 2 bolts hand tight to hold the cover in place.
4.9 Setting Up the Bulkhead Fitting
Apply thread sealant to the threads of the bulkhead body.
Screw the bulkhead body into the tapped hole, and tighten.
Wipe the area clean of any excess thread sealant (inside and
outside of the housing).
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.
Insert the small drilled end of the center compression nut over the
extended tube as shown in the assembly diagram (Fig.13.), 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.13.)