Approved for use by all major breweries. Shutoff valve is ball type check valve that prevents product back-up into regulator. Solid brass body. Regulator has "Shut down" safety system (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 gauges.