I looked high and low for these pre-filters for our Drinkwell Platinum fountain. We've had it for about five years now and its working fine, but the pre-filter has cracked and is falling apart. This site was one of the only places to have these pre-filters that I could find. Others were completely sold out or the item isn't carried any longer. I'm so glad I don't have to buy a whole new fountain when all I needed was the pre-filter. The order was as promised and came in a timely manner.Thank you for having just what I needed!