http://www.tianyisunspipeline.com/coupling/ The product is easy to install and easy to disassemble. Set the connector evenly in the joint position of two different pipes and then tighten the screws.Is a very flexible coupling system used to assemble almost all types of piping materials and to repair old piping systems. Material Specifications: BodyDuctile Iron GGG50/40 End RingDuctile Iron GGG50/40 Rubber SealRubber Bolt &NutDacromet Coated Steel CapPlastic Flexible Universal JointCoupling manufacturers website:http://www.tianyisunspipeline.com/coupling/