4hp piston air compressor 3kw power supply Low oil comsuption Very quite CE, ISO9001 Approved Specifications abt RC high end piston air compressorConfigurations abt ... Japan & sweden , greatly incleased the performance and service life of air valve ,Piston ring used Taiwan Riken , durable , non-oilCrank shaft ... lcoated in shanghai Warmly welcome to visit anytime! 4hp piston air compressor 3kw