Featured exclusively on airspade air-excavation tools, supersonic nozzles deliver superior performance vs. Competitive nozzles, or open pipes. Patented design turns compressed air into high speed, laser-like jet moving at twice the speed of sound – mach 2. The result is faster and more efficient excavation, uncovering underground utility lines, and pipes, or even sensitive tree roots without harm. Non-sparking nickle aluminum bronze construction. Compatible with all airspade 4000 components and accessories. features: non-sparking nickle aluminum bronze construction patented internal geometry knurled surface provides superior grip for tight connection female threaded connection