UZ90P4 set for cavity wall mounting, all circuit distributors of the UK500 series are suitable and prepared for cavity wall installation. This only requires the UZ90P4 cavity wall set. No special cavity wall distributor is required. The upgrade is as stunningly simple as the cavity wall assembly itself. It is not screwed-on, nothing can shift. The fastening is as easy as for cable ties. The cavity wall set can be again released for all cases. The pull strap can be screwed off only after the end of the work.