Metal joint restraints in the nature of metal pipe fittings, metal pipe couplings, and metal pipe gaskets used for joining and restraining ends of pipelines; metal joint restraint harnesses for pipelines; flexible metal expansion joints for pipelines; ball joints for pipelines; metal retainer glands in the nature of pipe connectors used in mechanical pipe restraining joints for connecting ends of liquid conduit pipe together; Metal flange adapter assemblies comprising metal gasket rings, restraint ring gaskets, and screw driven wedges in the nature of restraint rings incorporating wedges that grip pipes, for use on plain end pipe; metal assemblies for protection from over-insertion of PVC pipe joints, comprised of springs and metal stop rings