My sink is on the large drivers side slide. The drain goes under and outside the slide, then back inside under the floor. This is a telescoping sewer arrangement with a 1 1/4 inch pipe sliding inside the fixed 2 inch black pipe. Has anyone replaced this sewer and where do you find 1 1/4 inch pipe and the seal at the end. Also everytime we dump then move on we get a sewer smell for 15 minutes. We think this damaged seal inside the telescoping pipe is wrecked and will need replacing. thanks Gerry