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A small single portable is considerably lighter than the dual-bottle installed system. You can't use lightweight bottles if you try to replicate the factory system, as they were never factory parts and aren't PMA'ed. The factory system is more suitable if you want 4 or 6 people sucking O2 without a complete rat's nest of tubes. I never have more than two people on oxygen and the modern pulse meters make a small bottle last a long time.
I have most of the factory hardware (except bottles) still above my headliner. Let me know if you're serious about going that route.
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1969 T337E
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