This CRL Albion Deluxe Professional Bulk Caulking Gun holds 10.1 and 20.3 fl. oz. (300 and 600 ml) Sausage Packs with its large capacity barrel, or 24 fl. oz. (710 ml) of bulk loaded material. Extra thick 5/16" (8 mm) square smooth piston rod with T-pull allows maximum gunning pressure on even stiff materials, and an instant pressure release button stops material flow. All-steel reinforced welded construction with a corrosion resistant, zinc plated body. An epoxy coated swivel handle rotates, allowing easy direction change and uninterrupted flow. Includes one 1/2" (13 mm) round metal nozzle.