... Excellent sealing: With the perfect combination of Novel-Polymer-Material body, and high-quality rubber this coupling has excellent sealing performance.2. Excellent ... steel,which is easy to transport. It can be made in various colors for different pipes.5. Specification is complete: It ... DN25, DN40, DN50, DN65, DN80, DN100, also it's in the development of more product specifications.6. Easy to operate ...