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Ningbo Sunwell Sealing Materials Co.,Ltd is one of the leading China oval ring joint gasket manufacturers and suppliers with one of the famous brands, and we are also a professional oval ring joint gasket company and factory, welcome to contact us. Description   The ring type joint was initially developed for high pressure and temperature applications found in the petroleum industry and is primarily used in the oil field on drilling and completion equipments. However, today this product range can also be found on valves and pipewo