Bronx 5th Alarm 05/02/13

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  Don't know if this is the reason for the reply,but here is a link to some extent...    http://www.firehydrant.org/info/hdraft01.html

 

I never saw an advantage Hard vs. Soft in performance myself. But to use a single section of hard tube requires "precise apparatus positioning". That may be the context of the OP. I always found it a P.I.T.A.