According to the PW Survival Guide, the # is...

Posted by Mark Davis on Friday, April 27, 2001 at 1:39PM :

In Reply to: thermostat ? posted by dean on Friday, April 27, 2001 at 8:12AM :

the same for both the 230 and the 251.
Napa # 55 is for the 160 degree.
Napa #155 is for the 180 degree.
You can thank Greg Coffin for the info!!!
Mark

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