Nu-Calgon Gallo Gun - Fits both 16g and 20g CO2 cartridges - 4179-01   Product Details  The Original Gallo Gun is a heavy duty CO2 powered tool that quickly and easily clears condensate drain lines with 800psi of oil free air! The Gallo Gun has a strong and rugged design, built with ergonomic finger grips, and comes equipped with a flexible hose assembly and tapered fitting to fit up to a 1À drain opening. The Gallo Gun utilizes a revolutionary dual fit cartridge base that can quickly and easily fit either a 16g or larger 20g cartridge for 25% more clearing power.  Fits both 16g and 20g CO2 cartridges  Includes 1 20g cartridge