Coltri pressure maintainig valve, where to get a service kit?

[iain/hsm]

probably rounding difference. Anyway it does not matter at all, 1/100mm is nothing. Less than nothing.

Speaking as a fellow member of this forum that machines your stuff and can offer you μ-precise machined parts with a machine tolerance better than 5 μm .......that hurts.

Further the CNC machine was supplied by you lot in Dietikon Switzerland and built by Tanks a Lots lot in Germany .......now that really hurts.

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[iain/hsm]

I just found out the other o-rings:
- 3.69x1.78 NBR 90
- 6.75x1.78 MBR 90

Agro

Can you re check item 2 above are you sure its not a 6.07 x 1.78 MBR 90 shore
I find it hard to accept that even the Italians would substitute using an Italian spec 0-ring

Of course it could just be a typo. But it's just that the bigger MCH36 calls for the 6.75 but the smaller Efficient line calls the 6.07. Granted both are larger than the I-Con (MCH-6) and as this is made for retail resale and sold through the dive shops for them to make a resale mark up profit. So who knows.

Maybe it really is a genuine typo but with French and Italian standards so no difference any old size will do.

 

[Agro]

Yes, it is 6.75x1.78 NBR90.
I measured original o-ring, ID is about 6.7-6.8.
Original Coltri part list sais 6.75x1.78.
O-ring seat is 7.2mm

6.75x1.78 is a very common o-ring size all over Europe. I've never heard about French and Italien spec o-rings.

1.78 in my eyes is a UK/US spec o-ring, am I wrong?

European sizes are 1.5 or 2.0 mm, as far as I know.

 

[rjack321]

LOL As I am the token Brit here on this purely American divers website I think I was being very polite against the French but I'm just as happy to lump in the Italians and while we are at it why not include you lot ROFL

But just to give the British unbiased and balanced overview I think that our American divers here may have a little trouble finding metric O-rings at the best of times let alone Italian UNI 106 junk copy stuff. Whatever next Japanese standards. ( Now I think that's a fully balanced viewpoint. Everyone referenced and I never once mentioned the war. )

Whatever next American divers on this forum buying from Alibaba and China""" Give me strength.
No wonder their President is jacking import tariffs on all those freeloading Chinese.

Screw the French it's the poor Americans divers I feel sorry for having to put up with so much Chinese fake and now this Italian junk stuff also.

Still I won't be buying an American electric car anytime soon I'm more than happy to continue tolerating another German brand. See how well we all get along together. Peace.

Actually metric o-rings aren't a big challenge to source over here on this side of the pond. Although in this particular case the 100th of a mm fractions may or may not be readily available. I havent looked that closely