Graco 7421 - Manual (Page 35)

4.3 Be Sure Your Vehicle Seat Belt is Safe to Use
The vehicle seat belt must be designed to hold the safety seat tightly at ALL
times. There are a variety of seat belt systems that are NOT safe for use with
the safety seat because they will not hold the safety seat tightly at all times.
We will first describe the seat belts that are not safe for use and then we will
describe those that are safe for use. Pay careful attention to these systems;
some of the seat belts that are NOT safe to use look very much like seat belts
that are safe to use. If you are unsure, contact the vehicle manufacturer or call
Graco at 1-888-224-6549.
Many seat belt systems are NOT safe to use with child safety seats,
even though they can easily be threaded through the safety seat.
Carefully read this section for information on seat belt systems and
refer to your vehicle owner's manual and any labels on your vehicle’s
seat belt. You may need to have a special seat belt installed by your
vehicle dealer before using the safety seat.
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