This Dual Body Regulator is perfect for those who want to keep different pressure on different beer styles. It is also used for those who wish to have beer and soda off the same CO2 tank. You can serve multiple kegs with this system by adding an air distributor to one or both outlets. These are the most consistently accurate/ well built regulators on the market! They stay on pressure even when your CO2 tank level goes down. UL listed. Approved for use by all major breweries. Shutoff Valve is ball type check valve that prevents product back-up into regulator. Solid brass body with extra long nipple. Regulator has "Shut down" safety sytem (blow off at 55 to 60 PSI.) Permanent Quad-Ring Seal on inlet nipple helps eliminate a source of leaks... no need to use a new fiber washer each time tank is changed. Heavy duty UL rated dual guages.