My husband has agreed to make me some carto tanks, since the place we usually order them from will be closed for a while. We use xl boge cartos and want to hold 5-6mls of juice. I found the tubing 3/4" OD 5/8" ID of PP. I have a few questions: 1. what size gommets and o-rings work best? 2. concerning material; is silicone rubber going to affect the juice (because I have read that vinyl is the way to go but when I search all I find is rubber) 3. fill screws, best place to get them.... I am trying to research all this on my own but any suggestions would be great!!!