YOST 45 degree B elbows are used when you need less of an angle than a standard 75 degree B elbow. Two elbows joined together will fit a five-inch overhang. You can also use the 45 degree elbow when dropping a leader pipe on to a lower roof with a steeper pitch. In addition to having a side crimp YOST elbows are sent through a spreader to allow the elbow to join with another elbow or leader pipe without any struggle. (.019 thickness)