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Running two propane tanks on your RV means never wanting to run out mid-trip. This Flame King automatic changeover regulator watches both cylinders for you — when the primary tank runs dry, it switches over to the reserve tank automatically, so you can pull and refill the empty one without shutting anything down.
It's a two-stage design, which means it holds a steady output pressure even as tank pressure and demand change, and it comes with the protective cover and mounting bracket already in place.
A solid upgrade for anyone tired of climbing out to swap tanks by hand or getting caught with an empty cylinder at the worst time.