This is a replacement part for the Flyboard Standard U-Tube, Zapata Racing Part #FB02014. Made out of stainless steel and delron. This is not for the Double Swivel U-Pipe, for the Double Swivel U-Pipe, you see the following link: Index Pin for DDS
This plunger is also a replacement part for the PowerFly Universal Nozzle or the Zapata Racing Universal Nozzle years 2016 and below.
Part of the U-Pipe Repair Kit