The 2.75 inch OD adaptor with a 1/2 inch wall thickness is more than likely
the one that fits the AB-621 mast system; which is basically a "big brother" to
the 577 system. The 621 uses 6 inch diameter mast sections and does not use
a clamp to hold the sections together. The launcher assembly is just like the
577, only a little larger to accept the 6 inch sections.
73,
Henry - K4TMC
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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