Paul_KD7HB:
I see metal tubes with some polycarbonate plastic parts. Nowhere is PVC tubing mentioned.Paul
I only meant that there are companies who design and build tube systems and that various capabilities and specifications can be included, not that the named company is necessarily the correct match for this project - although they could be : "Kelly Systems provides custom as well as standard pneumatic tube systems for its wide range of customers."
Someone who does this for a living would also be a good partner to have in that they'd be able to locate materials, provide specialized/custom parts, and, importantly, offer general expertise in this area.