LG GF22BGS Owner's Manual page 21

21 INSTALLATION
 If your existing copper water line
will need an adapter (available at
plumbing supply stores) to connect
the water line
to the
refrigerator OR
with a tube cutter and then use a
 Shutoff valve to connect to the cold
water line.
have a water inlet with a minimum
inside diameter of 5/32 in. (4 mm) at
the point of connection to the COLD
valves are included in many water
supply kits.
Before
purchasing,
make sure
a saddle-
type valve
complies with your local plumbing
codes.
NOTE
A self-piercing saddle type water valve
should not be used.