Replaced the Thetford with a Dometic 320 in our 2017 36RL. It fit perfectly. Also added an inline shut-off valve which was purchased from Home Depot. It would have been a five minute job had I not added the shut-off valve.
Carl & Patti
2018 RAM 3500HO 4x4, 4:10, 6.7L, Crew Cab, DRW, Aisin, LB, Air Bags, 50 Gal. Transfer Tank
2017 RW36RL, 3 AC's, Auto Level, Slide Toppers, W/D, D/W, Res Fridge, Convection Microwave, Sleep #, Heated Tanks, Slide N Slide, 17.5" Sailun S637, Disc Brakes, 8K Morryde IS, TrailAir Air Ride 21K Pin, B&W Hitch