Nikon Nikon 1 AW1 Reference Manual (en)

Non-Waterproof 1 NIKKOR Lenses
The supplied O-ring protector must be attached to the camera
lens mount before the camera can be used with non-waterproof
1 NIKKOR lenses like the 1 NIKKOR VR 10–30mm f/3.5–5.6 shown
in the illustrations below. Use a soft cloth to remove any foreign
matter from the inside of the protector before use, and be care-
ful to prevent dust entering the camera or adhering to the O-
ring protector.
Remove the rear 
lens cap
Remove the camera body cap
Remove the O-ring protector 
from the body cap
Place the O-ring protector 
over the O-ring