Tec7 Pur gun is a teflon coated gun that can be used with most expanding foam spray cans that allows you accurately control the dosing/dispensing of product. The Tec7 Pur gun with its long nozzle makes it perfect to apply on those hard to reach area's making it perfect for use when installing doors and windows etc. Teflon Coated Expanding Foams will not stick to it