Big Blue24

I just went through the same problem twice. You can get on the bolt easier if you remove all 5 1/2" bolts that hold the backing plate on the HX35. Once the backing plate is removed, and the nut that holds the water line is removed, you can get a 15mm box end wrench on there. Or if you're like me and you rounded the nut, you can get a good pair of vice grips on there and it breaks free really easy.