A foam gun helps with deploying foam into specific locations, perfect for sealing up draughts. We have a range of expanding foam applicator guns to suit your needs. An applicator gun should have five key components: nozzle, pin, trigger, lock-off screw and inlet valve. First squeeze on the trigger will release a burst of foam, the trigger should then regulate the appropriate flow. Ensure you use expanding foam gun cleaner to keep your gun and nozzle clean after use. It will remove all uncured PU foam, it is suitable for either gun or hand foam.