GX maitenance

I've been maintaining several Gx compressors for a while now, this is what my 2-3 year old CS2?looks like today.
A couple times a year I open them up and check the head and check valve. Then once a year i tear it down, clean it good and fill the piston recess with grease, lube the rest lightlt and it's good for another year.
Here's pics of how filling the piston groove with grease will lightly lube the cyl walls.

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Since this discussion is about maintaining the Gx compressors, I wonder if anyone can help me size the O-rings within the fill whip. It seems that the O-rings, there are 2 green O-rings in my Gx CS3-1 fill whip - 1 larger than the other, have broken into several pieces and I am unable to fit them together for a measurement. Any help is much appreciated.
 
Since this discussion is about maintaining the Gx compressors, I wonder if anyone can help me size the O-rings within the fill whip. It seems that the O-rings, there are 2 green O-rings in my Gx CS3-1 fill whip - 1 larger than the other, have broken into several pieces and I am unable to fit them together for a measurement. Any help is much appreciated.
I’d like to know that too…
 
What is the biggest mystery to me has to do with the manufacturers and vendors not making said O-ring sizes known. My guess is their attempt to make additional sales at inflated pricing. GX compressors for example want $9.99 plus shipping for the 'Quick Connector' O-rings (2) and will not inform me or the actual size with sent an email. Maybe I'll just order a new Quick Connector for my Fill Whip.
 
What is the biggest mystery to me has to do with the manufacturers and vendors not making said O-ring sizes known. My guess is their attempt to make additional sales at inflated pricing. GX compressors for example want $9.99 plus shipping for the 'Quick Connector' O-rings (2) and will not inform me or the actual size with sent an email. Maybe I'll just order a new Quick Connector for my Fill Whip.
"What is the biggest mystery to me has to do with the manufacturers and vendors not making said O-ring sizes known."

Me too.. it's a joke .

Like a certain oring they hide that fact is $12$ at P.A (+ 8$ shipping)

Another is how many have that gun like here at age and never reply with a measurement or something to a post asking "does anyone know what size thei guns o ring is" ..lol.

Nope hundreds of guys with that gun but not a clue or can't just check there's to reply . Especially a simple probe one ..lol