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I think they're the same diameter as the Yamaha fittings
They leak!!what problems are you having with them?
That's the funny thing. The fittings and all look absolutely brand new, but leak like a sieve.Ask your parts guy at the local merc dealer,
he'll know more than I do.
I'd replace the entire hose with a new OEM hose.
If the O-rings are gone, I'd be questioning the reliability
of the internal valves of the squeeze ball.