The rubber hose is not to be used in a kiln. I had Craig (of Arrow Springs) make a threaded stainless tube to attach my Stump Sucker. I drilled a hole on the kiln door so the stainless tube can stick out from it. The rubber hose is attached to the stainless tube.
Graphite do degrade in heat but it's not that fast. It won't crumble after only several uses. But the thread that stainless tube fit tend to get loose, so I wrap a small amount of glass fiber around the tubing to fit it tightly.
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