We have the new design, and that make the valve have a good tightness. We increase the area of hand shank, so that the goods will have good touch feeling. The body has been worked through the Boring Machine. It makes the holds have the same size, and insure the tightness. The Disc is made of Modified PP, and we make the surface of the Disc smoother, and improve the roundness, so that the tightness is improved also. The stem is made thicker that will not broken easily. We are pay more attention in the good quality, so that we will insure the products have a good tightness before we sale it.