RAW Rapid Sekhmet gauge for HM1000x - Dimensional issue!

Dowty washers wont seal the gauge on the RAW, because the quick-fill v-block has an o-ring pocket cut into it. A dowty washer is too big to fit into that pocket, so it will leak. You must use a washer on the RAW gauges. Don’t use teflon tape, because they aren’t 1/8 NPT tapered pipe thread, they are 1/8 BSPP straight thread.

I'm getting ready to replace my gauge with one from HUMA and I would also like to replace this o-ring. Does anyone know what size it is?

Thanks!
 
Bummer! Hopefully you have a spare. If the spare works, can you please post the size? I need to replace my RAW gauges too.

Thanks!
Had an old service kit from Martin with spare gauge O-ring - part 805052.
Likely 90 durometer as it needs to keep it‘s shape upon compression.

Anyway, leak solved 🙂.
 
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Nice! Did you have to screw it in super hard to keep it from leaking?
No the Sekhmet gauge is threaded so that when it’s screwed in snugly (by hand) it faces forward on the v block perfectly. The new O-ring sealed with minimal effort.
Don’t over-tighten, it may disfigure the O-ring.
 
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