How to fit a SUP fin in a US fin box / SUPboarder How to Videos Words by Reuben Ellis ~ Jun 9, 2017Apr 27, 2019 This is a very basic beginner video on how to fit a SUP fin in a US fin box.The US fin box is the most common fin box on the market today and it is usually used for large centre fins on surf and SUP boards. Easy to do when you know how. Subscribe Notify of new follow-up comments new replies to my comments I allow to use my email address and send notification about new comments and replies (you can unsubscribe at any time). Label {} [+] Name* Email* Website Δ Label {} [+] Name* Email* Website Δ 0 Comments Inline Feedbacks View all comments Related brand posts