Well, there's a funny story about that, actually...
I wound up having to go out and find a stainless steel 5/8" washer anyways. Upon adding hot water to the mash tun to preheat it, the rubber washer deformed and the whole thing began leaking like a sieve. So no, rubber washers are not safe for mashing. Rigid nylon would be, but not rubber. I wound up finding a build-a-bolt kit in stainless that I used the washers from.
On top of that, though, I found out that the whole thing cracked around the inside. The whole way around. I think my pre-heat water was too hot, and caused the plastic to buckle and crack. So now I need to silicone it before using it again...Either that or buy a new cooler...Not sure I want to spend that kind of money right now, but we'll see. I'll probably buy the silicone later this week and seal it, then wash it out a few times with soap and water before next brewday in two weeks or so.
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So many things to keep track of...Not enough space to write about it anymore.
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Two Ravens Brewing
"Quaintest thoughts - queerest fancies
Come to life and fade away;
What care I how time advances?
I am drinking ale today."
-E.A. Poe, "Lines on Ale"
Follow me on Twitter: @tworavensbrew
Member of the American Society of Brewing Chemists
http://www.asbcnet.org
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