I can tell you that the Merc tube used on those engines is an odd size, and as of yet, I've not seen an alternative that fit PROPERLY.
There is a way to change the rigging flange out to use the standard 2" hose, BUT it becomes pretty crowded in that tube. It is, however, a more durable tube.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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