Scubapro G250V

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That o-ring just protects the threads, it doesn't seal the hose. You can leave it or remove it. The sealing o-ring is inside the hose fittings.

The SP splined hoses may be marketed as 'heat sinks' but I think they're just there to annoy DIYers who need a special SP wrench to remove the hoses.
 
Annoying or not, any increase in surface area is for heat transfer. The jam spline nut, at a minimum, should stay. No opinion on the hose nut.

YMMV
 
On the two G250Vs I have I'm trying to get Halcyon Halo jam nuts, but finding them is like finding a unicorn. I've tried Extreme Exposure but contact with them I've found is hot and miss. Anyone got a lead on some? Cheers.
 

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