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I have a new GE stove. The installer mistakenly used a 3/8 valve instead of a 1/2 valve as listed in the installation instructions and they don't want to change it because they say it doesn't make a difference in flame height/heat/performance. I called GE directly and they agree.

Is this correct or they just being lazy?

Thanks in advance.

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As long as the oven only needs the output from 3/8" then there is no issue with this at all. I would think that that 3/8" could supply any home oven (that's still a lot of gas) so I don't think there is an issue at all. If the manufacturer agrees then there is no reason for you to worry about it.

Frankly the installer probably installed the shut-off that he normally installs for ovens. Most ovens are fed with 3/8" or 1/4" so he might not even have had this on him at the time.

This is akin to having a 1" water line going to a bathroom shower and a plumber using a 3/4" shutoff for it. There are almost no shower valves that can even take 3/4" of water and certainly not 1". Lazy I don't know. If your shower has inputs of 1/2" or less it doesn't matter. Just like if your oven can only take in the output of X (which may be less than a 1/4" feed) then it doesn't matter. It only matters if he installed it right.

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    I agree, if the manufacturer says it is fine why do you have a problem with it? – Ed Beal Feb 17 '17 at 18:47

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