heavy duty convertible 1-c PU foam gun Teflon coated basket, needle and nozzle, Teflon non return ball The gun can be used either by upper basket model, connecting to a foam can, or by bottom load model, connecting to a foam tank with a hose. Lazy gun: The worker does not need to clean the guns with solvent after use, due to the sticking-proof features of our guns. 30 days later when the worker unlocks the needle, the gun works as well as before. The foam inside the gun won't get stuck (without taking off the foam cans away from the adapter). It is very easy to remove dried foam from the Teflon coated parts.