This standard describes bolted, sleeve-type couplings, reducing or transition
couplings, and flanged coupling adapters (couplings) used to join plain-end pipe.
Couplings may be manufactured from carbon steel, stainless steel, ductile iron, or
malleable
AWWA C302-2004 history
2004AWWA C302-2004 Reinforced Concrete Pressure Pipe, Noncylinder Type