I installed the Fridge Defend in my Norcold 2118 today. Fairly simple, the hardest part is getting the insulation & metal around the boiler tube back together. I had to do it by feel cause when I had my arms up there I couldn’t lean down & look up, when leaning down & looking up I couldn’t get both arms up there at the same time. Typical situation when working on RV’S. The wireing was easy. Comes with good instructions. It’s supposed to prevent fires. Hope it works!