Any ideas why this dryer gas connection diagram calls for the "1/8" NPT Pipe Plug" - why isn't it just calling for a direct connection to the gas supply instead of having something that T's off with a plug?

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    Interesting. I checked another one at (essentially) random - a Whirlpool - and the instructions (different diagram, so presumably a different model) have the same 1/8" NPT Plug. Commented Aug 5, 2021 at 2:14

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That "T" with the 1/8" threaded connection is for checking the down stream gas appliance and piping for any gas leakage and to check the gas pressure to the device. I would rather use a "T" with a 1/4" threaded connection. It eliminates the need for the manufacturer to supply a "test connection", and saves them a couple cents.

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