Additional information and details on mechanical couplings are provided in Chapter 9 of the Plastic Pipe Institute (PPI) Handbook of Polyethylene Pipe.

Mechanical Bolt Type Coupling

Bolt type couplings are available to join PE to PE or to other types of pipe such as PVC, steel and cast iron, in sizes from 1¼" IPS and larger. These couplings compress an elastomeric gasket around each pipe end to be joined, to form a seal and may incorporate a grip ring that provides pullout resistance, possibly exceeding the yield strength of the PE pipe.

Mechanical Bolt type Coupling for Joining Steel Pipe to Pe or for Joining Two PE Pipes