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The same white plastic washer/o-ring is in the MK20. Pain to replace as they can crack with use and as you say, not in the service kit...

Would be interested if anyone knows if the low-pressure poppet is the same in both the Maximus and the 109? I've converted a few 109s to the new poppet which hasn't been cheap - but see the Maximus poppet on eBay selling for a song ($2.50...)

Awesome, thanks for the pdf - nice to see a summation all in one place! This is marked 2008 - any updates to newer regs? Thanks

Thanks for the assistance to all tracking down where to buy the tiny orings for the G250 poppet. For all of those looking for a place that sells the 1mm x 2.2mm oring, I used www.Oringsandmore.com . The price is $2 for 50 orings. Specifically, Metric Buna O-rings 2.2 x 1mm Price for 50 pcs

Hi Kupu, yes, you were right on that - thanks much for the link and test... Will get an order in. Best HTF

Ah, much appreciated!

Hi Kupu - thanks for taking the time to post this - super appreciate your effort. I believe I'm looking for the 2.2mm x 1mm orings - they're the super small ones that fit the Scubapro G250 poppet. The one you posted is a little too big... Any info you find is always appreciated!

Hahaha - okay, yes, the live-or-die test is always a good indicator of success. The oring we're discussing is the 1mm x 2.2mm I believe. I've been using www.theoringstore.com for my orings - fast and cheap orings but they don't carry the 2.2 - actually, I take that back, they do carry the 1.6mm...

Hi Zung - this may be addressed in a different thread already - but concerning the two little o-rings on the g250 poppet measuring 2.2mm x1mm, would you feel comfortable using a 2.0x1 viton 75 or would you go with the larger 2.5x1 viton 75? I ask as the site I use for all o ring orders has the...

Awesome, thanks much!

Thanks so much Couv for the reply - yes, I should have copied the link I was referencing to avoid confusion/extra work looking for it! This was an informative reply and from memory, I just did install the piston stem o-ring as a 90 duro viton, but think the large o-ring around the head of the...

Have always enjoyed reading the DIY how-to's on the forum as I'm an avid tinkerer. I would be interested to get feedback on something I'm currently working on now. I've been servicing my own MK10 for a few years - and I find the 'appropriate' o-ring by comparing the old ones I've taken out to...