Bond It professional PU foam gun applicator, a heavy duty metal gun with a chrome finish. It is designed for sealing and isolating cavities when mounting and fixing windows, door frames and similar. Use it with gun-grade polyurethane foam cans. A gun applicator gives better control over where the foam goes and how much is used than a hand-held can, so it suits repeated use on site. Clean the gun after use following the foam manufacturer's instructions. Always wear suitable eye and hand protection when working with expanding foam. Check the gun is clean and the valve is working before fitting a can.