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HMI also manufactures Back Pressure Check Valves, Needle Valves, Ball Check Valves, Plug Valves, Sampling hose assemblies (featuring hand tight connections), Sample Cylinders (for laboratory use only), Sampling connections, Laboratory apparatus for testing petroleum products per ASTM Designations, Reid Vapor Pressure Bombs, LPG Vapor Pressure Bombs and various adapters and fitting for use with them, 98C Corrosion Test Bombs, copper strip method, for LPG and 98B cylinders for testing low pressure petroleum products, Copper Strips sanded and un-sanded, multi position copper strip holding vise, thermometer well fitting for pressure tanks.