Neil Greenbaugh, a fellow bycer, sells them. I bought a bunch from him and love my new waterers that I made! So do my chicks!! Search for nipple waterers and you will see a whole bunch on the threads. I like the pvc one for my run and I made a cranberry juice plastic bottle into a waterer for my tractor. Works great. I put the nipple through the cap so I can discard the bottle and replace it with a new one when I need to. Pvc also works great for feeders as well.