Custom plastic extrusion and injection molding and secondary operations in the nature of electromechanical assembly of custom manufactured articles to the order and specification of others; Custom manufacture of extruded and injection molded plastic devices, articles and assemblies, particularly in agricultural, industrial and electrical product lines, namely, gates for surface irrigation pipe and sprinkler package component, in particular, drop pipe, hose weights, u-pipe, drive shaft shields and bells for center pivot irrigation systems.