Standard o-rings in Apex/Aqualung regulators?

[billi]

Hello.

Can anyone tell me if the o-rings used in Aqualung/Apex regulators (1st and 2nd stages) are of standard sizes or they use some proprietary parts?

Thank you.

[QatarDiver]

Which regulator model?
Define 'standard' I doubt if either brand actually mould their own O rings....

[billi]

By "standard" I meant the sizes you can freely buy form an o-ring supplier.
Actually, I have already found all sizes used in the Apeks line of regulators. Now I am looking for the sizes used in Aqualung's Legend models.

By the way, Apeks uses EDPM duro 80 o-rings. It it safe to replace them with Viton duro 90?

Thank you.

[Texfrazer]

By "standard" I meant the sizes you can freely buy form an o-ring supplier.

Yep.

By the way, Apeks uses EDPM duro 80 o-rings. It it safe to replace them with Viton duro 90?

Should be no problem.

[billi]

Thanks guys.

For Apeks regulator most o-rings are indeed readily available from many shops.
However, there are 3 that are of less common sizes:

BS606
BS607
BS0151-16

Anybody knows a mail order supplier with those in stock (Viton or EPDM)?

Thanks again.

[Bubbletrubble]

EPDM 70 o-rings are easier to purchase online than the EPDM 80.
For low pressure application (second stages), people haven't had any problem with using the EPDM 70 o-rings.
You can purchase EPDM 70 o-rings at aoptec.com. Aoptec also carries metric sized Viton 75 o-rings which should work for the second stages.

Since there are important non-o-ring parts (hydrostatic diaphragm, diaphragm, HP valve) in the first stage kits, I figured that it was worth it to just purchase the entire first stage kit. For this reason, I didn't even bother purchasing first stage o-rings separately.

For Legend regulators, I suspect that for o-ring part numbers 820XXX, the "XXX" refers to the 2-XXX sizing of standard o-rings. I deduced this from looking at Aqualung regulator part diagrams and correlating known sized o-rings (e.g., o-ring inside second stage/LP hose connection = 2-010) with the Aqualung part number (820010).

From looking at the Aqualung regulator part diagrams, you'll also see that sometimes Apeks parts are used. These are designated as parts starting with "AP." Relevant to overhauls, you'll note that the LP seat in Aqualung Legend second stages is the same LP seat used in the Apeks second stages (AP2034).

Please share any other info you might find. The rest of us would be very interested.

Hope this helps...

[billi]

Thanks Bubbletrubble!