â–²Features: â— For use with professional Heat Gun/welder gun, hot air gun. â— Fit for standard 5.2mm diameter, easy to install and replace. â— Ensure that the speed welding nozzle is clean with sharpcutting edge. â— Used for polypropylene, polythene, PVC and polycarbonate variety hot melt plastic. â— Stainless steel construction for more durability and high temperature resistance and anti-leakage.