This electric sump/other valve works great and is well built. A manual valve wouldn't work for my application, so I gritted my teeth and bought. There are other cheaper 12v bulbs out there but this one seems to be much better built and has a faster usage rate etc. It'll be cheaper anyway and they'll probably sell twice as much for half the price. A 4 star rating is purely a price for functionality - pure functionality and quality would be 5 stars.