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The ball seals directly on the O Ring.  In Reply #2, I suggested using Neoprene  ,(Buna N)  (max Temperature = 240 F ) rather than Viton, max Temperature  = 450 F, because IMO, the stainless ball seals better with Neoprene. With sufficient crush on the O Ring, it may not make a difference,  but I was worried about the case of minimal crush.


I have not found a good way to estimate how much crush I am getting.


Slick


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