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I am slowly getting fed up with my 3L Pony cylinder pulling me
sideways, therefore, as I like redundancy/alt-air-sources, I am
thinking about switching to a twin set.

300 bar cylinders are now starting to hit the shops here and a few air
stations are offering fills, hence, I thought about twin 7Ls or twin
10Ls at 300bar.  I have 300bar gauges and 1st stages that will change
to the din/screw fitting (currently A clamps), so there is not too
much problem with the other bits and pieces.

As the 300 bar tanks have to be stronger, how much more do they weigh
when full, compared to 232 bar tanks ? Does any one have the comparative
weights for 7L and 10L cylinders ? Does the ~30% increase in capacity
justify the increase in weight ?

Twin 7Ls with a joint manifold and the option of adding my pony
centrally seems interesting - but will I be able to carry them ? 

- nigel.

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