If it is some hard grey stuff, I'd like to know the answer as well. I destroyed one regulator trying to get the inlet pipe out, so I could gang two regulators. The case cracked before the joint would release! I think it's Bondo or JB Weld. The other regulator used Teflon tape and came apart without a problem.
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Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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