6 Parts predominantly made of metal, for gas and liquid braces, in particular sleeves shutters, sleeve shutters, straps, shackles, caps, flanges, safety devices against traction, dirt and rotation fittings, couplings; connecting systems, predominantly made of metal, between a fitting and the aforesaid brace; accessories, predominantly made of metal, for the aforesaid braces, namely hand wheels, position indicators, dummy covers, insertion pipes, nipples, rings; shaft covers, height-adjustable and/or levellable shaft covers and their base components and frames; braces made of metal, namely, gas and liquid braces, in particular sliders, installation mountings, tapping braces, also for subsequent installation