1.5inch longer that the regular Pack Mount Extension, the 3 gallon extension is used to stack a 1,2,3, or 4 gallon fuel pack on top of a 3 gallon pack (RX-3G).
If the base fuel pack being stacked on is anything besides a 3 gallon than the normal Pack Mount Extension (RX-EXT) would be used.
RotopaX (patent pending) are proudly made in the USA by the original manufacturer of the 1st generation fuel and water packs. RotopaX are a unique modular system, unlike anything else you have seen before.
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