1 .Sun Elegant valve stem threads use the self-made extrusion or NC lathe,the thread intensity is high, precision.
2. The stem concentricity has high accuracy.
3. The stem uses the patent technology precision to achieve the mirror surface effect .Opens shuts with ease, the leak-proof   quality is good.
4.The stem is fully machined.
5.The valve stem entire wrap production craft achieves the international advanced level.