Hi all! I am preparing to build my coop, and wanted to make my own watering system. Sounds like the waterer nipples are the way to go. I found some on ebay that are called ND-R1 Heavy Duty Waterer Nipple (from cconly). They seem reasonably priced with free shipping. I was wondering if anyone has used these - reviews sound like the seller is legit, but I trust you all and wanted your opinions. Thanks!