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Re: parts?
They are 1/8 NTP (tapered pipe thread) for the most part & 1/4 OD tube.
Locally hardware & big box building supply stores.
Automation Direct also has a large selection
<http://www.automationdirect.com/adc/Shopping/Catalog/Pneumatic_Components/Pneumatic_Fittings_-a-_Air_Couplings>
All though I could be wrong, I don't see the plumbing rules changing.
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