PC4-01: industrial standard, high pressure resistance, suitable for DIY and 3D printing and other scenarios. Thread: British thread (BSPP) G1/8Inch (about 9.7mm) Commonly used in European and American equipment, compatible with 1/8-inch pipes. Compatible air pipe size: Suitable for 6-8mm air pipes (G1/8 adapter is required). Sealing method: British thread (BSPP), parallel thread + sealing gasket. Pressure level: Higher pressure resistance (less than equal 1.6MPa), suitable for industrial equipment. This accessory is only used in the 3D printing industry, and no technical support is provided for other industries. 3D printing uses hard pipes to pass through directly, while other industries use hoses, sleeves, etc. Notes:Threads are not universal: PC4-01 (G1/8Inch) and PC4-M6 (M6) are not directly interchangeable and require an adapter. Note:The PTFE tube showed on the picture is not included in the package. Color:As Shown Material:Brass + Plastic Package Contents: 4 * PC4-01 Pneumatic connector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.