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Teflon Tube: outside diameter 4mm, inside diameter 2mm; density 2.15-2.20g/cm3; it made of premium PTFE (Poly Tetra Fluoro Ethylene) material, safety and non-toxic, heat resistant up to 260℃ PC4-M6 fittings: thread M6/3mm, inner diameter(blue end) 4mm, fit for the tube whose outer diameter is 4mm, the fitting made of premium copper and plastic, sturdy and durable PC4-M10 fittings: thread M10/6mm, inner diameter(black end) 4mm, fit for the tube whose outer diameter is 4mm, the fitting made of high qulity stainless steel and plastic, high hardness, antioxidtion, anti corrosion Compatibility: compatible with all 1.75mm PLA ABS 3D printer Installation: connecting by the outer thread of the quick fitting, easy to install