Can this seat be installed with a lap belt?

Hi Natalie, thank you for your inquiry, the Diono RXT can be installed with the lap belt both rear-facing & forward-facing, however, depending on the weight & age of your child, there is a difference in how it is to be installed. We would recommend having your local Baby On The Move Car Seat Technician install this for you. We hope this helps. if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have.