I saw these horizontal nipples here on BYC and wanted to give them a try. I have an outdoor 5 gallon bucket with vertical nipples and an aquarium heater plugged into a thermocube (only turns on below freezing) but refilling was a chore and after trying 3 different nipple suppliers, all dripped a little and made a nice ice patch. I wanted something larger that I didn't have to refill so often and wouldn't freeze. Rich (Solway Feeder rep) sent me a couple of these to test the pressure in a 55 gal drum I picked up on local classifieds for $15. He was top notch and fast to respond. I tested two and no leaks! Drilled a small hole and screwed in hand tight, and then the rest of the way flush to the barrel with a wrench. I then ordered 10 off eBay and added 3 more to complete the waterer. I then added a float valve at the top which hooks up to the sprinkler system and will top off once a week for seven months. During winter, I'll have to fill it up with a hose, but far less frequently, perhaps monthly. I hope to drop a stock tank deicer in it to prevent freezing, and with the large volume it shouldn't be a problem. As you can see, the girls love it! I did the same setup with a hog nipple in the bottom of a drum for our pygmy goats and it's a real time saver as well.