lauter tun help

[speer1234]

Hello, I'll be using a large plastic cooler and will be turning it in to a lauter tun. I plan on drilling a larger hole in its draining hole at the bottom of the crate to allow a faucet to be inserted. On the inside I will have a " [] " shaped copper pipe rectangle connected to it from the inside with holes drilled in which to allow the hot mash to drain.

Same as in this video: [ame]https://www.youtube.com/watch?v=3XcPhDDNP9I[/ame]

Now my question is, when I insert the pipe / faucet in the hole I need a filler to keep it water tight yet I need it to be food safe and not have any off flavors ruin my wort. Any suggestions on what I can use?

Thanks, Cheers!