It is the TF135 that I wish to convert to the PRT system from the style where the old stat is on the end of the water rail and slips into the engine close to the bottom of the head on the off side.
So my question is basically why do I not need a second jiggle valve?
Did the later TF135's fitted with a PRT have a 2nd jiggle valve? If not why not as they must have experienced water squirting into/across the expansion tank. 

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