Profile: Ningbo Belt Pneumatic Machinery Co., Ltd. is a manufacturer of pneumatic fittings and hydraulic fittings. We also manufacture quick disconnect couplings of plastic pneumatic components, quick straight couplings of moulds, adjustable couplings of pneumatic components, dust blower and pneumatic tools direction control valve, air conditioning unit and pneumatic cylinder. We are accredited with ISO 9001:2000 certification. Pneumatic cylinders (sometimes known as air cylinders) are mechanical devices which produce force, often in combination with movement, and are powered by compressed gas. The pipe joint fittings can be used with rigid nylon tubes. A locking nut is provided and can be tightened both manually and with a spanner. The special shape of the guiding cone ensures that the tube can not be accidentally cut.