About Us: Qjaiune is proud to provide consumers with satisfactory and high-quality products. All our products have undergone strict quality inspection before packaging, so you can buy with confidence. Satisfying the needs of customers is the top priority of Qjaiune, we are committed to making your work easier through our products, you can completely trust the quality of Qjaiune's products. Product Advantages: Pneumatic fittings are made of high-quality mental and pure copper surface, wear-resistant and heat-resistant. The surface of Pneumatic fitting is nickel-plated to prevent rust and corrosion. Push fitting can be used to transmit air, vacuum, etc., and is widely used in electronics, medical, machinery and other fields. Product Specifications: Tube OD: 4mm Thread Specification: 1/4" NPT Material: Mental & Pure Copper Surface Finish Type: Nickel Plating Body Type: Male Straight Applicable Tube: PU / PA / PE / PVC Fluid Admitted: Air, Vacuum Working Temperature: 0-60°C | 32～140°F Package Contains: 10 x push to connect fittings About Service: Qjaiune is committed to providing customers with high-quality products. If within 30 days you are not 100% satisfied with the product, such as buying the wrong size, please feel free to contact us, we will within 24 hours provide you with a satisfactory solution.