Good points but it's not as scary as it looks. The splitters are really hanging off the bigger tubes rather than resting on the small bore. The hose I use is Legris 10/7 Flexible Polyurethane Polyether Tubing which is stiff enough to take some weight on the end so hopefully it isn't resting much weight on the small stuff which is Tygon R3603 5/3mm. That said I probably should replumb so every thing is stilling in the right spots.
There are fixing holes on those manifolds, though I didn't use them. The fact that I was using them in the parallel section makes it all look a lot more complicated. As the splitters have a second, blanked G1/4 at the end, you could chain them together for an 8-way with a single pipefitting.
As for the hose being blasted off, I guess its an issue which I'll look at if I ever get a DDC into the rig. However if takes a fair pull to get the stuff off as it stands so hopefully it will behave. You guys can probably tell me a lot more about Tygon than I know, the concern would be if it lost its elasticity.
Of course they could have used legris 5mmOD push-fittings and PUPE tube but that would have been harder to work with
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