Product review (5 stars): cheap and can potentially save you a lot of money!
I got these after watching a youtube video about fixing a dryer that is not heating.  Since the price was quite cheap on amazon for these particular parts, what did I have to lose at that point?  I followed the youtube video and replaced the valve coils.  Miraculously, this simple replacement installation fixed the problem immediately on the first try!  I just saved myself from having to spend a ton of money on a service call or replacing the dryer altogether.  After experiencing this temporary inconvenience, I'm going to "baby" my dryer and clean out the lint after every cycle....protect your investments!