Sealing rings and sealing slides made of plastics or of a combination of plastics and with a further material, whereby plastics overbalance, for fixing electric contacts in pin-and-socket connectors; line connecting parts made of plastics or of a combination of plastics and metal, whereby plastics overbalance, in particular for electric lines; branch pieces made of plastics or of a combination of plastics and with a further material, whereby plastics overbalance, in particular for electric lines; connecting fittings made of plastics or of a combination of plastics and with a further material, whereby plastics overbalance, for hoses or corrugated hoses serving for the protection of electric cables; connection angles or connection bows made of plastics or of a combination of plastics and with a further material, whereby plastics overbalance, for hoses or corrugated hoses serving for the protection of electric cables; ball joints made of plastics or of a combination of plastics and metal, whereby plastics overbalance, in particular for electric lines; reducers made of plastics or of a combination of plastics and metal, whereby plastics overbalance and reducing fitters made of plastics or of a combination of plastics and metal, whereby plastics overbalance, in particular for electric lines; cable and hose couplings and threaded hose couplings, mountings, clamps made of plastics or of a combination of plastics and metal, whereby plastics overbalance, in particular for electric lines; sealing plugs made of plastics or of a combination of plastics and metal, whereby plastics overbalance, for electric machines, for appliances, also for medical devices and appliances and/or for switch cupboards; housings made of plastics or of a combination of plastics and metal, whereby plastics overbalance, for electric installations, with or without electric connections or with or without connections for electric or electronic components or appliances or for other electrotechnic purposes; cable and hose couplings, cable and threaded hose couplings, mountings, clamps made of plastics