Scubapro O-ring Sizes

[ams511]

@Zung Welcome Back !!!

 

[Hawaii Treasure Finder]

I tested the 2.5 and it works; I don't know about the 2.0, so you have to test it yourself. And if you're still alive after the experiment, tell us all about it.

Then again, since this isn't a high wear item, it'll probably last a while and give you enough time to source the right stuff (2.2).

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 x 2.2mm and 1.5 x 2.21 Any shop you recommend that carries the correct 2.2? Thanks!

 

[Zung]

Like couv said a few posts back, PAI has them, item #40-87. There's a minimum of $40, which should last a few life times, or you can setup a group buy here.

Alternatively, you may consider kits from Vintage Double Hose.

 

[Kupu]

Looking for SP oring 01050363, I came across 2.2mm ID x 4.2mm OD x 1mm C/S 70 Durometer Rubber Buna O-rings. 50 pcs for $2.00 plus $3.00 shipping. Oringsandmore

Am I wrong in thinking this could work? Possibly this option has already been discussed somewhere, but did not see it.

 

[Couv]

Hi Kupu,

Yes, that should work fine. In fact SP used Buna until they went to EPDM. That is a great price too. The only questions would be of quality control. The shelf life of Buna/Nitrile is 15 years. How old are they? From where were they sourced? Is the variation in size tolerance acceptable?

For $5 it is certainly worth the gamble. Install the seals on a poppet, then perform a check to see if they hold up. Remove the spring and stand the poppet seat down on a very flat surface (like glass.) Push down on the balance chamber. The chamber should spring back up due to the pneumatic pressure in the poppet & chamber.

 

[Scubagaskets]

Scuba O-Rings NBR 70Sh-2.20x1.00-Premium O-rings Provider for Scuba Diving
Product quality guaranteed. Production date 2017

 

[Hawaii Treasure Finder]

Looking for SP oring 01050363, I came across 2.2mm ID x 4.2mm OD x 1mm C/S 70 Durometer Rubber Buna O-rings. 50 pcs for $2.00 plus $3.00 shipping. Oringsandmore

Am I wrong in thinking this could work? Possibly this option has already been discussed somewhere, but did not see it.

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!

 

[Couv]

I'm looking for the 2.2mm x 1mm orings

Hi HTF,

The size Kupu posted is the same-he also included the outside diameter which is often excluded as it is the I.D. plus 2 times the cross section.

 

[Kupu]

I received the poppet orings mentioned in post #334 today. Looks like a winner, they pass the bounce test and to my eye appear in good condition and size match. When performing the bounce test, I sealed the LP seat with my index finger as that ensured a solid seal to perform the test.

 

[Hawaii Treasure Finder]

Hi HTF,

The size Kupu posted is the same-he also included the outside diameter which is often excluded as it is the I.D. plus 2 times the cross section.

Ah, much appreciated!