Mini Max FS-41 Elite 4-1/2" OD Dust Port. What connects?

[Mike Hoyt]

So I grabbed the 4 inch Fernco and it works amazingly well. like it designed for it!! Thanks Jim

[Mike Kees]

When you actually measure the ID of a 4'' fernco fitting it is 4 1/2''. Made to fit over 4'' ABS pipe which is 4'' true inside diameter with 1/4'' thick wall thickness x 2.