Stops nozzles becoming blocked and increases the shelf life of sealant These cartridge nozzles have a universal screw fitting to fit standard EU3 cartridges. The nozzle incorporates an additional thread to which the screw cap can be fitted when the cartridge is not in use to keep cartridges air tight. Using the additional screw cap will prevent the silicone from hardening in the nozzle and will prolong the shelf life of the cartridge no more throwing away half used tubes Features & Benefits Use with silicone sealant mastic caulk etc. Screw Cap secured in place by threaded nozzle Air tight cap prevents hardening inside the nozzle Nozzle can be cut to desired size Increases shelf life of opened cartridges Prevents curing in cartridge so reduces wastage Prevents nozzle blockage