A pair of square-flange connector housings with a bright silver metal finish, each with a mounting hole in every corner of the flange. These connector parts are precision components engineered to link systems, compatible with small, medium and manifold assemblies. One housing has an externally threaded barrel ending in a crown-shaped serrated rim. The other shows its rear side: a round cylindrical bore with internal slots and a small radial hole in the barrel wall. Each part is manufactured to meet exact tolerances and material specifications for reliable performance.