Aftermarket tool that is functionally equivalent to the following tools:
Fox 803-01-986 Rear Shock, Rezi End, Air Fill Adaptor, 2023, Float X2/DHX2
Fox 803-01-826 Kit: Tooling: Rear Shock, Rezi End, Air Fill Adaptor, MY 2021
RockShox Air Valve Adaptor ‎00.4315.027.010 
 
This is essential for inflating IFP chambers of several models of Fox and RockShox rear shocks during damper service, such as 2021-2023 DHX2 & Float X2, RockShox Moanarch, Monarch Plus, and Deluxe, etc.