ARB RD101 - Manual (Page 30)

3 Installing the Air Locker
28
Figure 22.
NOTE : Excessive tightening of the center compression nut is
not necessary to form a good seal around the tube
and may damage the O-ring or the threads of the
compression nut.
NOTE : Make sure the seal housing tube is all of the way into
the center compression nut while you are tightening
it.