These piston reciprocating air compressors are robust with internal solid parts. They come with leak-proof fittings and deep-finned cylinders for efficient heat transfer. Reciprocating air compressors (also known as Piston air compressor) are positive-displacement compressor that uses a crankshaft-driven piston and cylinder to compress the air. Successive volumes of air are confined within a closed space and elevating this air to a higher pressure. The reciprocating air compressor accomplishes this by using a piston within a cylinder as the compressing and displacing element.