Sounds to me that you have two sewer outlets. Which if you do they make a Y connection so you can hook two hoses up to one sewer. Brand and Model number would help determine this. Are there any extra pulls near the 2nd discharge?
Derek, Wife, and 3 kids
2016 NorthPoint 377RLBH
2015 GMC Sierra 3500 DRW SLE Duramax
B & W Companion