Easy to Install: Pneumatic Fitting is suitable for pipes with an outer diameter of 4mm and can be automatically locked by inserting the pipe Product Material: PU4 Tube Fitting Tube Connector is made of plastic material, PC4-M6 Pneumatic Straight Fitting is made of zinc alloy and plastic material. Applicability: Suitable for 3D printers.   Nota: En este articulo se ofrece envió gratis siempre y cuando se ordene junto a otros artículos.