What is this regulator part

[MountainManJoe]

I was washing this CO2 regulator and brass piece fell on the floor. I can't figure out where it goes. Any ideas?

 

[day_trippr]

You would use that insert to retain the original square O-ring used on that regulator stem.
It's not used with the much thicker nylon gasket, which is fine...

Cheers!

 

[MountainManJoe]

I've never seen a square o-ring.
Anyway, it seemed to fit nicely between the regulator output and the hose barb adapter so I put it there. Seems to work.

 

[mac_1103]

"Square" o-ring actually means flat o-ring. As opposed to round. Even though they're both circles.

 

[day_trippr]

That adapter is doing zip there, but it's not a bad storage location...

And square actually means square...

https://www.globaloring.com/square-rings/

Cheers!

 

[mac_1103]

square actually means square...

OK, so I should have said square can mean the same thing as flat in the case of o-rings.

 

[Agent]

I'm just imagining some square pipe and square fittings that mysteriously work a la Minecraft.

 

[wsmith1625]

Looks like the retainer for the flat washer, however the washer you have looks old and stretched out. Check out this video for changing the flat washer on a TapRite regulator.

 

[Snuffy]

I've never seen a square o-ring.

It's the one with the pocket protector and white socks. Oh - wait. That's a nerd O-ring.