Sergio - great thread! Thanks for sharing this, and can't wait to see where this leads. And it's great that you documented how people can save a bit of cash with a DIY on a single cord 4-bulb Tek. Great work.
I'm intrigued with your novel John Guest fittings - kind of a manifold really. Very cool. But I'd think you might want a check valve where this enters the your 3-in-one contraption. Unless I'm missing something, without a check valve at the base of that 4-2-1 fert manifold, if you lose a connection at any point on any of those 4 lines, you are going to drain your tank. Something to think about.
Also, on the 3-in-1 contraption, why did you chose the black flexible hose instead of PVC? I'm sure there's a good reason.
Do share it with us please.
And as to those nifty little fittings for your probes, I see you have the kind that has the little sliding iris bits. There are two type out there - one does not have those, and they can (sometimes) work better. But their range of hole size is smaller. They just have a O-ring that gets compressed and expands. But sizing them can be tough. I use the kind you are showing too. But I have found that sometimes, depending on the fitting size and the probe size, that I can get a better fit if I wrap stretchy rubber pipe sealing tape around the probe (making it a bit thicker). The rubber tape gives the fitting something to bite into for a better seal.
Good luck! I really look forward to following your progress.
