20oz (1 1/2 pint ) Teflon coated Air-Powered Gun. Teflon Coated Barrel reduces piston Friction. Easier to pump and clean. A standard steel barrel coated with DuPont's face improves clean-up. Teflon eases the dispensing tool process and substantially reduces the friction between the piston and barrel when coupled with Teflon pistons, thus requiring less thrust to dispense material. 120 psi