Storz Coupling Material:Brass or Aluminum Connection Method:Binding Expansion Typle:Hermaphroditic Reference Standard:DIN14302 Specifications:1’’ 1-1/2’’ 2’’ 2-1/2’’ 3’’ 4’’ 6’’ Remarks:Aluminum Storz coupling often divides into long tail and short tail.Its production technique often uses die-casting or pouring/teeming practice.And the brass Storz coupling often uses forging or hammering.