Product review (5 stars): Perfect fit!
I purchased this to replace the one on my unit.  My unit was leaking from a couple of different spots, including near the solenoid, so I decided to replace all of the components to fix all of the leaks.  It fit my unit perfectly and was an easy install.  Instructions came with it to help the novice (like me!) install it correctly.  I also watched the video Aprilaire has on their website before attempting.  All in all, took about 15 minutes, due more to the tight space I had to work in than because of any issues with the part.