re: How much should it cost to add a short 1/2" natural gas line ?

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You have the fitting already.

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So just turn the gas off, unscrew the cap that is at the bottom of the tee that goes into the house, add another tee to tap the line off (with a shutoff valve and 1/2" quick connect) and create another dead end to catch the moisture. Its that easy.

See setup I purchased earlier today in the post below.