There is a pretty easy and reliable way to check the diaphragms to determine if they will make it through the winter. First listen. It the pulse is not a quick and clear pop then chances are you will be OK for a while. Next look at the tab that stick out of the diaphragm (made of diaphragm material). If it is cracked looking then replace it. Put the tab between your fingers and rub on the diaphragm. If it feels like little pieces of sand coming off or rough then replace it.
This simple and easy check may prevent you from having to crawl up on a roof in the middle of a blizzard.
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