ISP(NINGBO FIT MECHANICAL COMPONSENTS) established in 2002, is a high-tech factory specializing in designing and manufacturing many kinds of seals with high-quality for the production and maintenance of Industrial water pumps ,Auto Cooling Pump, Mixer and Agitator.Such as mechanical seals,rubber sealing rings,rubber gasket,PTFE washer and some other sealing parts used in mechanical seals, including carbon tungsten alloy ring (TC Ring),silicon carbide ring(SIC Ring),graphite ring(CAR Ring),ceramics ring(CER Ring).