I got them from someone here on the forum, but its been a while and I lost his email. I drilled the 23/64 holes he recommended into 1" PVC, but they all leaked, and a couple of them cracked. Would silicone stop the leaks? I am frustrated as I am leaving on a trip and the last time we left the water duties to someone else a chicken dropped dead, probably from lack of water. Lots of teflon tape did not work!