Even though they look expensive it's always good to have other options out there, especially if they have better flow and are designed for the higher temps.

I have just had my vehicle converted by Fitian with a Pollack valve in it so I don't need one myself, but if it ever fails or other people start experiencing problems with their (genuine) Pollacks I'm sure you will get plenty of customers.

As you say they are cheap compared to a tow in the middle of nowhere.

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Sean