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Old 09-01-2017, 09:45 PM
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The remaining part of the valve should screw out....but it may take heat to do it as it is likely rusted in.

Rust formed over the bottom of the tank is the reason nothing comes out now, air compressors are bad for this unless drained on a daily basis. Even after you get the valve casing out, you may have to poke through the rust in the tank to make it drain. Best do it with no or very low (20 psi) pressure in the tank and safety glasses ON.
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