6-inch cut piece of 1-inch copper pipe - Size L or M

I have the thicker (L?) copper pipe. Is that ok for the 6-inch of 1-inch copper pipe before the wireless flow meter?

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Shouldn’t be an issue…


Any rigid pipe that is suitable for water and doesn’t have any fittings in it will work. L (Blue) is what you want to use if you have copper and is to code but PVC will also work and is becoming more common - the key is that the pipe is straight and have nothing in it that could create an eddy or chaotic current because these will give you inaccurate / inconsistent flow readings. The purpose 6"-12" of straight pipe is just to acquiesce the flow.