John Morris Coupling Material:Brass or Aluminum Connection Method:Binding Typle: Binding Flush(Rapid plug-in) Reference Standard:BS336 Specifications: 1-1/2’’x1-1/2’’ 1-1/2’’x 2-1/2’’ 2-1/2’’ Remarks:Aluminum John Morris coupling often uses die-casting or pouring practice production technique.And the brass one often uses forging or hammering technique.