LogAn'sRun, do you mean Push-INs? A quick look through the Legris online catalog doesn't show any soft line compression (Push-ONs) fittings.
I have Legris Push-INs in the rig I'm posting this on. The thing with Legris (and most other manufacturers) is, they put a stupid hex for an Allen wrench inside. On the fittings I have in use now (G1/4'x12mm w 12x8 Ether based Polyurethane tubing) they use a 7mm hex, I think this is what Catar is trying to avoid . IIRC, it drops to 6mm for 10mm O.D. tube fittings.
With the Tygon, the material itself isn't strong enough to resist the forces placed on it by the fittings. You would need to add a thin brass, copper, or delrin(?) insert to support the tube from the inside.
FWIW, I have some Delrin fittings on order from Mcmaster that don't use a internal hex that look like they "might" be from John Guest. I also have some more of that polyurethane coming and I also order some tubing that hopefully will work out even better.
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