The Nuke Performance Remote quick lock filler cap for 50mm (2") fuel filler hose, for all motorsports, and aftermarket fuel cells.
Featuring a lightweight design, quick lock mechanism, and a 5-bolt pattern, this filler cap is the ultimate solution for easy, secure installation on your aftermarket fuel cell or Nuke Performance CFC Units. With just a 90-degree turn, you can lock and unlock the cap with ease.

 Quick lock, with a 90-degree lock mechanism
 Barb connection for 50mm (2") fuel filler hoses
 Universal fitment for your motorsports build
 Viton o-rings and gaskets, safe for all types of fuel
 Safety wire kit included

Further info:

https://www.nukeperformance.com/product.html/quick-lock-filler-cap