... 4. OEM requires optional U-Bend Copper Fitting Copper fitting, cu fitting, pipe fitting, copper pipe fitting, copper tube fitting, connecting fitting, a/c fitting, air conditioner fitting, copper return bend, u bend, y bend ... high quality copper & in advanced technology.ItemDARMaterialHAILIA01-16.3520.721.55TP2HAILIA01-29.5225.423TP21. The above drawing & data of sheet for the ...