Radian RXT (Manufactured prior to May 2016) February 07, 2021 16:29 Radian RTX (Manufactured prior to May 2016).pdf 1 MB Download Related articles When does my Diono car seat expire? What is my seat's expiration date? Radian RXT (Manufactured as of May 2016) How do I find my seat's date of manufacture and serial number? Rainier (Manufactured as of May 2016) How do I recycle my Diono car seat? Comments 0 comments Article is closed for comments.