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The Netafim FlexNet adaptor has a 4" ASTM PVC spigot and an insert for 4" FlexNet pipe.
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.
The 4" spigot fits inside a matching ASTM PVC socket for solvent welding.
Prepare and solvent-weld the PVC joint using the procedure specified for that pipe system.