€¢E4E Aluminum Vent elbow €¢4-piece construction and is fully adjustable to 90 degrees €¢ Includes one crimped end and one solid end to ease assembly >> Dundas Jafine€™s aluminum elbows can be used to vent most types of heating units. This product features an all aluminum; 4 piece construction and is fully adjustable to 90 deg. Includes one crimped end and one solid end to ease assembly."