Sump washers are squash washers, annealing again (which means make soft) will probably not expand it again to allow it to squash flat to seal off.
I have read that if you heat up a copper sump plug type washer to glowing it will re-anneal (sp) it making it good to go again.Any one know if this is correct? Ordinarily I would simply buy a new one but the size is not available off the shelf and the source of a genuine one is bloody hopeless.
Sump washers are squash washers, annealing again (which means make soft) will probably not expand it again to allow it to squash flat to seal off.
heat up to cherry red and quench in water will make it soft again
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