I am remodeling a 33 year old bathroom and took out a 60″ 30″ cast iron tub. The new tub has an 18″ rough in for the drain and the old one was 15″, can I just put a ninety on the old drain to move it over or do I need to go down to the cast iron drain pipe and change it there?
Never heard of a roughin for a tub at 18″ or 15″, what kind of tub you got, reg. bathtub roughin is about 7/8″ to 1- 7/8″ from wall. if you can use 2 45 fitting it would be better but you could use 2 90s.