Questions about compression fittings

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Gun Freak
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Here are a few Q's for anyone who can anser.
I want to make a copper piston valve using compression fittings, and not soldering. So...
1. Can the pipe slide through the fitting without modification? This is to make the seat, so whether I go with coaxial or tee, I need this option or I need suggestions to make the valve seat.
2. Are there such things as compression bushings, or will I have to use a short piece of pipe in the front port of the tee, to a reducer, in which the seat will go in?
Thanks in advance to anyone who can help.
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MadPiper2.0
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If you are going copper you are going to have to solder eventually. It's like using PVC without primer and cement.
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Gun Freak
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Not necessarily, you can use compression fittings made for pvc....
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jimmy101
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And compression fittings for copper pipe that are about as strong as soldering.
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jrrdw
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1) No
2) You can get pre-made reducers.
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