Most excellent information. LOL, my Phototherm came with a cork as a plug, but it works well. i need to pick up another as I tend to miss place it from time to time.
I did get 2L bottles from Dollar General and use 5L bottles for my developer. I got 1/4 inch PEX pipe and a 1/4 inch double sided white plastic connector at Lowes, a little heat on the pex and the connector fits in well, and just put a hole in the top of the bottle and it works like a champ. I also found a nice container to put under the phototherm to put the chemical bottles in just in case.