Britax Safe-N-Sound Instruction Manual page 32

SETUP - SEATBELT FOR REARWARD FACING
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Instructions for Installation & Use
Step 4. Feed vehicle seatbelt through blue
REARWARD FACING BELT PATH
guide, ensure the seatbelt is not
twisted during installation.
Step 5. Continue feeding vehicle seatbelt
through opposite blue REARWARD
FACING BELT PATH guide.
Step 6. Engage the vehicle seatbelt buckle
and tongue without twisting seatbelt.
ENSURE THERE ARE NO TWISTS IN
SEATBELT. REMOVE SLACK.
NOTE: Seatbelt extenders should not be used
if the seatbelt is not long enough to secure the
child restraint. If they are used then the buckle
must not enter the seating zone.