B21/B23 refillable cylinders have 12-1000L series and different pressure levels, and the filling medium includes all the low pressure liquid gas listed in 《Supervision Regulation on Safety Technology for Gas Cylinder》. Our products could meet the different needs of the market. Heptafluoropropane cylinders have two types of vertical and suspended, and the valves can be customized according to customer requirements.Heptafluoropropane cylinders can be widely used in Heptafluoropropane gas fire-extinguishing system for subway, clean room, computer center control room, precise instrument, museum, library, communication equipment, electrical equipment, hospital, chemical material and oil products and so on. The steel gas cylinders are the perfect container for heptafluoropropane gas, and receive all customers’ good comments.