Hi Haley, Thank you for your enquiry. The Britax Parkway Boster does not require or use a tether strap for installation. This seat can only be installed using Isofix and a 3 point seat belt. If you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you our online store finder where you can find contact details for your nearest Baby On The Move store. Here, one of our expert Car Restraint Technicians can assist you in finding the right restraint for you, your child and your vehicle and assist with installation. We hope this has helped with your query.
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