Vibration isolation, Noise dampening, Thermal expansion and contration, Pipe alignment and seismic movement, Pump connection and flow ***** has been supplying piping specialty products to the commercial HVAC industry since ***** it has two factories producing vibration absorber corrugated pipe, expansion joints, flexible hose and braid, and also matching work, punch work ang all kinds of finish maching hardware ***** we get the UL certification and the C-UL certification. we are long experienced in producing metalwork, we have capacity of exploituring products, and service timely and effectively. If you have any questions, please feel free to contact us.