Eccentric Round Reducer
A round pipe reducer flat along its bottom, with a straight length at each end: the oblique cone and the two straights, each its own plate. A round pipe reducer flat along its bottom, with a straight length at each end: the two straights rolled from their own plates and the oblique cone between them developed, in one plate or two halves.
How the eccentric round reducer is developed, with a worked example · Reducers