NEW UNIFLOOR 500 , GROOVER 500-LP & MINIFLOOR DRIVE from Leister. Winkelman Sales has hot air welding kits for vinyl flooring installers. Featuring the TRIAC AT. We have custom made kits for specialized flooring, automatic welders, hand welders and wave groovers. Custom nozzles to make the job go better. Groovers for most flooring systems.