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Transmission Check Valve

Here is a pic of a poppet type check valve. This is a Parker with a nitrile-BUNA spec seal and aluminum case, 1/4 thread. 27 smackers each. It has a cracking pressure of 1/2 psi, but I think the spring can be heavier to give it a higher holding and cracking pressure, since the ATF sloshes around quite a bit.

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