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It's debatable whether it is a "recommended upgrade". Either design can understandably have problems after 20+ years of use, so the "recommendation" is more accurately just to check, and/or replace the line if it is suspect.Is this an upgrade only recommended for the 3116 or is it also a good idea for the 3126?
To my knowledge, there are only reports of old/original steel lines failing, so the "upgrade" is a "solution" to a problem that doesn't really exist, and introduces its own weaknesses. The steel line will flow better.