It easily switches from a 1:1 to 2:1 ratio in just seconds with convenient snap-on/snap-off push disks. The patented cartridge stabilizing plate ensures secure placement of all cartridges, while the adjustable aluminum air regulator gives you precise control. The air dump valve instantly stops the flow, and reverse air with a quick disconnect nipple makes setup and cleanup a breeze. Perfect for use with 200/220 mL cartridges.