TOTALLY TUBULAR - VACUUM TUBE INSIDE & OUT
Central vacuum tubing was once cast iron, thank goodness things have changed. The size of vacuum tube has also changed
over the last century and the universal standard in the USA is 2" vacuum tube. This differs from schedule 40 plumbing tube (DWV - drain, waste, vent) which is about 2.21" ID. Both tubes are made from the same material, PVC (poly vinyl chloride). Vacuum tube is much thin ... http://www.vacdepot.com/article/138
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