For general use when using one torch. Features all-brass construction to hold up even in corrosive atmospheres. Extra-large 2-3/4″ pressure gauges so you can easily read PSI even when you are at a distance from the cylinder. Large 2-3/4″ diaphragm ensures constant delivery pressure.  A check valve is installed on all Propane 510 regulators. All have 9/16″ outlet connections. Fuel gas has left hand thread. UL listed.