The Crazyfly Lock Tube (donkey stick as they call it), is a simple but flexible one-piece tube that fits right on the chickenloop itself to keep the chickenloop locked onto your spreader bar. This avoids any potential accidental unhooking.
This is the standard Lock Tube they've had on the Sick Bars for the last few years. Though they rarely go bad or get lost, it's a simple thing to repair that you wouldn't want to go kitesurfing without.