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Old 03-10-2020, 02:18 PM   #4
10/10ths
"50 Years of 550 Spyder"
 
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Join Date: Jun 2015
Location: The Road
Posts: 918
Fyi:

A mechanic that I trust on these machines told me that the manometer test is really useless.

The AOS can fail without warning.

The membrane is either good or it’s not.

Just R&R it every four years.

Cheers!
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