Asepsis Self-Contained QS Dual Water System w/2 Liter Bottle Deluxe models have a selector toggle allowing you to switch between city & bottled water Models for 750-ml & 2-liter bottles Standard 28mm thread or patented quick-switch system for water bottle Pressure gauge 7265 Mounts to vertical surfaces Optional post-mount available On/off toggle releases bottle pressure Air purge toggle Metal cover w/ white powder coat finish