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Posted by Raymond on March 04, 2004 at 08:10:29:
In Reply to: Re: The other bad thing about big firetubes posted by steve on March 03, 2004 at 05:24:37:
: A ring made of refractory that fits inside the morrison tube. Its prurpose is to compress the flame and help keep it from lifting off the burner.
Many thanks Steve
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