The canister portion of the valve has no fluid in it, only electrical parts, and corrosion is what is retaining the plunger. Turn it upside down and soak the plunger barrel w/penetrating oil, let it soak. Then, by hand, slam the upright valve down on a wood surface. What you are trying to do is jar the plunger loose so that it moves down without damaging the barrel. Any movement is good and success is when you get to where it moves freely. It is a slow process and not every one will free up. When you do get it free, power it up and add some penetrating oil to the valve chamber and work it some more with 12v. Clean it all up, replace the wire if needed and re-assemble. Good Luck, Carl
If you find simpler ways to free it up, please let us know.
If you find simpler ways to free it up, please let us know.
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