Comparison : Item # 12456512002, Union Elbow Hose Connector 12 mm Black
Item # 12456516002, Union Elbow Hose Connector 16 mm Black
Item # 12456520002, Union Elbow Hose Connector 20 mm Black
Item # 12456525002, Union Elbow Hose Connector 25 mm Black
Item # 12466516003, Union Elbow Hose Connector 16 mm Brown