Set A - 6" through 15" without bubbler tubes - Includes 18" Adapter and assembly.  Does not Include 14" or 16" Weirs.
 
Set B - 6" through 15" with bubbler tubes - Includes 18" Adapter and assembly. Does not Include 14" or 16" Weirs.
 
Set C - 18" through 48" Adapter Assemblies for 15" Volumetric Weirs.