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Hi Jeff,
I haven't yet tried the plumber's wrench on the tank bung. I have used a basin wrench to loosen a heater hose, but on the tank bung I got lucky when I looked around the house for a suitable spanner tool and found this to fit perfectly.
One advantage of having something like this tool, or the purpose-made (correct) tool, is you can put some downward force while turning, to aid in getting the tapered fingers of the lock ring engaged while compressing the O-ring for a good seal. I supposed it could be done with the crossed screwdrivers, but a lot depends on the surgeon's coordination, skill, and patience, working through that barely adequate incision.


(Taken from In the Tank)
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Art Benstein near Baltimore
A dog teaches a boy fidelity, perseverance, and to turn around three times before lying down. -Robert Benchley
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