are the 47ci flatlines steel or aluminum?

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  • Polishpickles451
    mag to cocker sellout ...
    • Mar 2002
    • 728

    #1

    are the 47ci flatlines steel or aluminum?

    Mine has a hydro date of 7 99 and the bottle is made by Catalina cylinders which I always thaught made aluminum products. But it seems to heavy for akuminum. The reason I am asking is becuase if it's aluminum it would need hydro now right? But steel has a 5 year hydro.

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  • cphilip
    Former Moderator

    • Jun 2026
    • 16216

    #2
    No all metals are five so doesn't matter

    I am not sure which on the flatlines but it takes more aluminum to be as strong as steel so often aluminums are bigger and as heaviy if not a little heavier than steel.


    AGD, where we are so good we can do it with only ONE tube!

    cphilip.com

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