Canadian Airgun Forum

So I finally remembered to take my spare air cylinders to my daughter's practice so I could fill them with a tank and check for leaks.
Turns out three of them were leaking. 2 were blowing right out through the valve on the end. I got lucky on the first one and it sealed up first try with a random oring out of a kit.
2nd one took five attempts to get it to hold air at 200 bar. After 4 hours it dropped about 10 bar.
Does anyone happen to know what size oring it's supposed to take? Feinwerkbau say "do not open" the air cylinder so I can't find any specs for the oring.
Cibles said they could send them to me for I think it was $6 or $10 each plus shipping. Not that I'm being cheap but it just looks like an oring I could likely get at any hydraulic shop.

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TX200 .177 10-50×60 Hawke Sidewinder
HW30S, Diana 280
2x FWB 700 Junior, FWB 700 Alum
Hatsan AT44 .25
Daisy Avanti 753S, 2x Daisy 953 cadet
2x Tau7

Princess Auto has O rings in kits. I bought the one in the orangy box. There are a multitiude of sizes & 407 O rings in the box.
From ID 1/8" to OD 1/4", up to ID 2" OD 2 1/2" & at least 10 of each size. I don't remember what it cost - maybe 20 bucks of so.
They also a metric "kit". I was able to use this kit to re-seal a couple of Gord's Air Force Talons as well as the intake seal on the Bam 51 I had.

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Best Wishes
Daryl

I have 8 different kits in SAE and Metric. I believe the oring may be an oddball size like some of the other stuff from Europe. What fits close is a 5 x 9 x 2 mm. I expect the original size is likely closer to 5 x 10 x 2.5.

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TX200 .177 10-50×60 Hawke Sidewinder
HW30S, Diana 280
2x FWB 700 Junior, FWB 700 Alum
Hatsan AT44 .25
Daisy Avanti 753S, 2x Daisy 953 cadet
2x Tau7

If you find an oring that roughly fits then you should be fine. I never have problem using orings of slightly different sizes.

Would measure the parts and give Hitech seals a call.

https://www.hitechseals.com/contact.asp?lang=

I ordered a few new ones from Cibles for my cylinders, as well as a new cylinder for my daughter for competition.
When I get the new ones I'll measure them and see what I come up with.

_________________
TX200 .177 10-50×60 Hawke Sidewinder
HW30S, Diana 280
2x FWB 700 Junior, FWB 700 Alum
Hatsan AT44 .25
Daisy Avanti 753S, 2x Daisy 953 cadet
2x Tau7

Based on my measurements this seems to be the seal I need.

_________________
TX200 .177 10-50×60 Hawke Sidewinder
HW30S, Diana 280
2x FWB 700 Junior, FWB 700 Alum
Hatsan AT44 .25
Daisy Avanti 753S, 2x Daisy 953 cadet
2x Tau7