How to make the test ball seal better

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waltsyd

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The new 4" test ball is letting water past, very slowly but enough to invalidate the hydrostatic test. I can see every joint but not the test ball (it's in a sealed wye) so I know it's the test ball. I've drained and repositioned plug three times. It's a little better but still leaks slowly. So what do you think of slathering some rectorseal or something else on the plug before inserting? Might harm the rubber? Any other ideas?
 
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Terry

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These are nice

cherne_clean_seal_plug.jpg
 

waltsyd

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solved

Forgot I hadn't posted that the problem was solved. There was a very slow leak at another joint (the only one that touched a bit of dirt hence it took awhile to find it). Job approved and done. Thanks to those who responded!
 
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