Features: Sealed and airtight, the air hose can be inserted and removed very often. With adjustable gas quantities, you can choose the most suitable gas quantities. Screwing in the laser head, insert the air pipe connected to the air pump or air compressor. When cutting flammable materials such as leather and wood, increasing the amount of gas can increase the cutting speed, prevent fire, and improve the quality of the cutting surface. The nozzle is made of premium material, durable and has a long service life. Specifications: Material: Brass + Plastic Set Type: 6mm Air Hose; Thread Dia.9.7; Unadjustable / Air Pipe 6mm; ThreadM5; Adjustable / Air Pipe 6mm; ThreadM6; Adjustable / Air Pipe 6mm; ThreadDia.9.7; Adjustable / Air Pipe 8mm; Thread9.7; Adjustable (Optional) Package List: 1 * Laser Machine Gas Valve Note: Prevent smoke from entering the laser head during processing and contaminating the focusing mirror. Otherwise, the focusing mirror is smudged, it is hot, and it is easy to burst. Therefore, if the nozzle is blocked or leaking, it should be replaced immediately.