Product review (5 stars): Great
I'm still not sure how it happened but moisture got into the old assembly and rusted it so badly that the spring broke inside the green plastic housing. I didn't know that this was the cause until I inspected it carefully and found that it didn't "bounce" like the other assemblies.  Anyways, this is a GE genuine product and I replaced it and it works great.  It's easy to replace and it helps if you can jack the tub up a bit to get enough room to slip this new part on.