The specs for the reservoir are 2.5" diameter, schedule 80 PVC pipe. Available at McMaster Carr for $86.28 for an 8' minimum order. I purchased through Harvel plastics for $5.60/foot (10" minimum). The fittings are 2.5" diameter couplings at a cost of $16.25 each. I ended up with a 24" reservoir that cost me about $95.00 with shipping.
PVC tubing is different and available at .50/foot
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