What does a sewer clean-out look like? The sewer clean-out is typically a three or four inch black pipe about level with the landscaping, typically located close to the home. It may have a black cap, with a raised square nut or a recessed slot, which can be unscrewed providing access for the pool water disposal. In a newer home, you may find that there are two clean-out pipes. In this case, the one closer to the home is the preferred access point.