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After extensive research I have not found a single solenoid valve that is all plastic. All have wetted metal parts (even those that are listed as polypro or plastic valves). Most have a copper shading coils even if the rest of the valve is plastic.
The only way to avoid the metal is to use a pinch valve. They are ~100$ to start. The next problem becomes finding pinchable tubing that has a ~00 P.S.I.G rating and can still be pinched.
Bean
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