TRNW-2: 6R80 vent check valve

[Steve Everett]

  Proof we learn something every day,  I've been building these units since
they started showing up in shops,  no telling how many I've built,  never
knew until today the vent on the case had a small rubber check valve inside
it ?

   I'm trying to solve a unit built by someone else that was difficult to
fill up , kept bubbling back out,  I'm still checking over things,  but
I've removed that little rubber check valve in hopes it wasn't letting air
out like it should .

   Steve
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