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Nai-Lok Sample Cylinders 3000psi Stainless Steel SS316 1/4 NPT Female Double Ended 500ml Seamless Gas Oxygen Cylinder, Find Details and Price about Sample Cylinder Seamless Cylinder from Nai-Lok Sample Cylinders 3000psi Stainless Steel SS316 1/4 NPT Female Double Ended 500ml Seamless Gas Oxygen Cylinder - SHANGHAI NAI LOK INDUSTRIAL CO., LTD.