Multiple ratio plural component pneumatic caulking gun. Nominal thrust of 490 lbs./2.5″ cylinder @100 psi service air pressure. Adjustable heavy duty aluminum regulator. Coverts easily to multiple ratio cartridges with simple snap-in/snap-out push discs. Automatic air dump valve stops product flos instantly. Patented cartridge stabilizing plate securely holds all cartridges. Comes with quick disconnect nipple. Plural Component Cartridge Types: – 300ml x 300ml – 300ml x 150ml – 150ml x 150ml – 300ml x 75ml