The Netafim FlexNet adaptor has a 3" male thread at one end and an insert for 3" FlexNet pipe at the other. It joins the supply pipe to a matching female threaded connection.
The fitting insert slides inside the FlexNet pipe until the pipe reaches the shoulder. A rubber seal sits in a groove around the insert. An external metal clamp tightens around the pipe to compress the seal and secure the connection.
Apply suitable thread-seal tape to the male thread before assembling the threaded connection.