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When you're running dual propane cylinders, this Marshall Excelsior regulator keeps gas flowing without interruption. Once the primary cylinder empties, it automatically switches over to the reserve tank, so your fridge, furnace, or water heater doesn't skip a beat.
A built-in indicator window turns from green to red when the just-emptied cylinder needs a refill, giving you a quick visual check instead of guessing which tank is low.
A packaged, ready-to-install replacement for RVs and trailers running a two-cylinder LP setup.
