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Two Sizes of Ampico B Unit Valves
By Bob Stewart 

Does anyone have information on why some Ampico B unit valve blocks
contain 11/16" valves and other have 13/16" valves?  Which size valve
was used first?  When did the change occur?  Why the change?

Bob Stewart

(Message sent Fri, 21 Feb 2003 20:44:24 -0600 , from time zone -0600.)

Key Words in Subject:  Ampico, B, Sizes, Two, Unit, Valves