Features：

O-ring is seated in disc and easy to be replaced. Choice of O-ring elastomers for different operating temperatures and environments. Standard cast iron nickel plated body. Aluminum bronze or nickel plated ductile iron disc options. Large diameter shaft on all size provides superior strength. Maximum disc diameter for each valve size, that has a greater free-flow area than the others. Open and close locking handle with more dependable locking capabilities.