Install the app
How to install the app on iOS

Follow along with the video below to see how to install our site as a web app on your home screen.

Note: This feature may not be available in some browsers.

EVOL Oring help evol

Nealgl1985

Nealgl1985

HAM Specialist
73
191
HAM Points
646.75
Country flag
Last edited:
I went to toms website and downloaded the oring sheet with all the sizes and figured since it took me a few minutes to search everything out I would post it here.

Will someone that is familiar orings and the sizes please double check and confirm I'm not ordering the wrong stuff?

If everything checks out then others can use the links to quickly make their own oring kits for their evols.

C-026-1070-00
1.5x7mm
70 Buna
Gauge, Foster

1.5mm X 7mm (NBR) Buna-N 70 Duro Metric O-Ring [N1.50X007] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC 1.5mm X 7mm (NBR) Buna-N 70 Duro Metric O-Ring [N1.50X007] - Buna-N Nitrile (NBR) Metric O-Rings – 70 Durometer The O-Ring Store LLC provides high-quality Buna-N Nitrile (NBR) Metric O-Rings, engineered for superior sealing performance across industrial, automotive, and...
www.theoringstore.com


C-026-1105-00
1.5x10.5mm
Buna 70
Gauge Spacer

1.5mm X 10.5mm (NBR) Buna-N 70 Duro Metric O-Ring [N1.50X010.5] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC 1.5mm X 10.5mm (NBR) Buna-N 70 Duro Metric O-Ring [N1.50X010.5] - Buna-N Nitrile (NBR) Metric O-Rings – 70 Durometer The O-Ring Store LLC provides high-quality Buna-N Nitrile (NBR) Metric O-Rings, engineered for superior sealing performance across industrial, automotive, and...
www.theoringstore.com

C-025-0005-11
Polyurethane 90 Durometer
22 Cal Breech/Bolt

AS568-005 U90 EU Polyether Urethane 90 Duro O-Ring [U90005] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-005 U90 EU Polyether Urethane 90 Duro O-Ring [U90005] - 3/32"ID X 7/32"OD X 1/16"CS Polyurethane: EU Polyether Urethane General Purpose EU Polyurethane rubber is notable for its combination of hardness with elasticity, outstanding abrasion resistance and tear strength...
www.theoringstore.com

C-025-0008-11
Polyurethane 90 Durometer
Regulator Adjuster & Piston
30 Cal. Breech/Bolt

AS568-008 U90 EU Polyether Urethane 90 Duro O-Ring [U90008] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-008 U90 EU Polyether Urethane 90 Duro O-Ring [U90008] - 3/16"ID X 5/16"OD X 1/16"CS Polyurethane: EU Polyether Urethane General Purpose EU Polyurethane rubber is notable for its combination of hardness with elasticity, outstanding abrasion resistance and tear strength...
www.theoringstore.com

C-025-0004-11
Polyurethane 90 durometer
Foster Check Valve

AS568-004 U90 EU Polyether Urethane 90 Duro O-Ring [U90004] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-004 U90 EU Polyether Urethane 90 Duro O-Ring [U90004] - 5/64"ID X 13/64"OD X 1/16"CS Polyurethane: EU Polyether Urethane General Purpose EU Polyurethane rubber is notable for its combination of hardness with elasticity, outstanding abrasion resistance and tear...
www.theoringstore.com

C-025-0013-11
Polyurethane 90 Durometer
Regulator Piston,
Valve Body

AS568-013 U90 EU Polyether Urethane 90 Duro O-Ring [U90013] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-013 U90 EU Polyether Urethane 90 Duro O-Ring [U90013] - 7/16"ID X 9/16"OD X 1/16"CS Polyurethane: EU Polyether Urethane General Purpose EU Polyurethane rubber is notable for its combination of hardness with elasticity, outstanding abrasion resistance and tear strength...
www.theoringstore.com

C-025-0016-01
Buna 70 Durometer
Chamber Insert

AS568-016 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring [B70016] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-016 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring [B70016] - Nominal Size: 1/16 CS x 5/8 ID x 3/4 OD The AS568-016 B70 Buna-N O-Ring (part number B70016) is a black, 70 durometer nitrile (NBR) O-Ring with a nominal size of 1/16 CS x 5/8 ID x 3/4 OD. It actually measures...
www.theoringstore.com

C-025-122-21
Viton 90 Durometer
Front Block, Regulator

AS568-122 V90 FKM/Viton® O-Rings – High Heat & Chemical Resistant Fluorocarbon (FKM) 90 Durometer [V90122] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-122 V90 FKM/Viton® O-Rings – High Heat & Chemical Resistant Fluorocarbon (FKM) 90 Durometer [V90122] - V90 FKM/Viton® O-Rings – High Heat & Chemical Resistant Fluorocarbon (FKM) 90 Durometer Upgrade your sealing performance with our V90 FKM/Viton® O-Rings, designed for...
www.theoringstore.com

C-025-122-21
Polyurethane Durometer 90
Front Block, Regulator
(SAME SIZE AS ABOVE BUT THIS IS ANOTHER OPTION BASED ON @Bladebum RECOMMENDATION) if you are having issues with the Viton 90 Durometer then you might want to try this out.

AS568-122 UC90 Cast Urethane O-Rings 90 Duro Disogrin 9251 TODI [UC90122] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-122 UC90 Cast Urethane O-Rings 90 Duro Disogrin 9251 TODI [UC90122] - Nominal Size: 3/32 CS x 1-1/8 ID x 1-5/16 ODPart number UC90122 is an AS568-122 UC90 cast polyester polyurethane O-Ring at 90 Shore A durometer, natural in color, TODI cured and molded from...
www.theoringstore.com

C-025-0117-00
Buna 70 Durometer
Regulator

AS568-117 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring [B70117] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-117 B70 (NBR) Buna-N Nitrile 70 Duro O-Ring [B70117] - Nominal Size: 3/32 CS x 13/16 ID x 1 OD The AS568-117 B70 Buna-N O-Ring (part number B70117) is a black, 70 durometer nitrile (NBR) O-Ring with a nominal size of 3/32 CS x 13/16 ID x 1 OD. It actually measures...
www.theoringstore.com

Screenshot_20231002_094704_Drive.jpg
 
No problem! It seemed overwhelming to me with all the different numbers and materials at 1st, then I felt like I had figured it out so I made this thread to confirm I was correct and pay it forward for all the help and enjoyment I've received on the forums. It seems that everything was confirmed by @Dairyboy on the AGN where I also posted the info... ENJOY!
 
Excellent post, this saved me a ton of time and money. Just a note, I have had a plethora of problems with the viton 90 122 for the front block and reg. I believe it's been 4 of those have blown since I've gotten the gun, I recently just switched to a cast polyurethane 90 for those which should hold up way better. I know Tom had switched to the viton because of the run of guns that had tubes out of spec causing leaks. So far so good with the poly
 
Last edited:
Bladebum said:
Excellent post, this saved me a ton of time and money. Just a note, I have had a plethora of problems with the viton 90 122 for the front block and reg. I believe it's been 4 of those have blown since I've gotten the gun, I recently just switched to a cast polyurethane 90 for those which should hold up way better. I know Tom had switched to the viton because of the run of guns that had tubes out of spec causing leaks. So far so good with the poly
Click to expand...
I edited my original post to include the info you provided about the viton 122. Thank you for sharing your experience. If anyone else has something they feel should be added lmk and I will edit my post.
 
Looks Good! Thanks for posting this for others. It is surprising to hear some are still having trouble with the viton 90 duro on the tube. Is the problem with the regulator or end block?

HPS now utilizes a back up ring and o-ring on the reg and tube. We have tested to 6k with no leaks or signs of extrusion and we did the test with the largest diameter tube that was within spec.

We'll soon have regulators and end block available to upgrade to the new system if desired. Also the system increases the max. fill pressure to 4k5.
 
Did you check the threads by the vent? With a wrong oring I had the leak there but was only detectable at that spot and was quite slow. Also alittle inside the foster fill wouldn't hurt. I know I could be telling you everything you have done already but just want to say where I had mine.
 
Dairyboy said:
Did you check the threads by the vent? With a wrong oring I had the leak there but was only detectable at that spot and was quite slow. Also alittle inside the foster fill wouldn't hurt. I know I could be telling you everything you have done already but just want to say where I had mine.
Click to expand...
Thanks, and yes I did both of those, along with the balloon technique. I would think if internal reg orings werd to blame, I’d see some reg creep (which I don’t), or it would leak to atmosphere theough that same notch in the threads. I’ve soaped that area, and no bubbles.
 
American Air Arms said:
Looks Good! Thanks for posting this for others. It is surprising to hear some are still having trouble with the viton 90 duro on the tube. Is the problem with the regulator or end block?

HPS now utilizes a back up ring and o-ring on the reg and tube. We have tested to 6k with no leaks or signs of extrusion and we did the test with the largest diameter tube that was within spec.

We'll soon have regulators and end block available to upgrade to the new system if desired. Also the system increases the max. fill pressure to 4k5.
Click to expand...
Hey Tom, appreciate your input as always! I had problems on both reg and end block with the viton, 1 blew on the reg and 3 or 4 on the end block. I have not had issues yet with the cast poly. I will say, the seals usually failed after a disassembly for reg adjustment, etc. I believe if just left alone after 1st installation they will last. Looking forward to the new systems to pick up for my gun!
 
Bladebum said:
Hey Tom, appreciate your input as always! I had problems on both reg and end block with the viton, 1 blew on the reg and 3 or 4 on the end block. I have not had issues yet with the cast poly. I will say, the seals usually failed after a disassembly for reg adjustment, etc. I believe if just left alone after 1st installation they will last. Looking forward to the new systems to pick up for my gun!
Click to expand...


Makes sense. Viton resists extrusion better than Poly but it is more susceptible to abrasion damage. Poly is decent in the extrusion department but excellent in the abrasion resistance. It is easy to see viton becoming damaged with multiple disassembly and having to pass over threads multiple times.
 
Madeintheuk said:
Ok so after hearing this, what poly orings should be ordered for the reg and body? I’ve had mine apart like 4 times now just to look for this leak.
Click to expand...
It appears the cast poly are out of stock, these will work just fine as well. Viton do still work, just in my experience they like to be not moved once installed.

AS568-122 U90 EU Polyether Urethane 90 Duro O-Ring [U90122] : The O-Ring Store LLC, We make getting O-Rings easy!

The O-Ring Store LLC AS568-122 U90 EU Polyether Urethane 90 Duro O-Ring [U90122] - O-ring Size: 1 1/8ID X 1 5/16OD X 3/32CS Description: Polyurethane Polyurethane rubber is notable for its combination of hardness with elasticity, outstanding abrasion resistance and tear strength. Elastomeric...
www.theoringstore.com

If your gun is still leaking, I would say it is in fact time to just reseal the regulator. Thats what I would do in your case.
 
A shout out, and a thankyou, to Nealgl1985 for making this post! Thanks!

I bookmarked this originally and it really saved me a lot of time ordering. I'm changing all of them at the same time so that I have a baseline. It's nice to have extras. I ordered both the original spec viton and the poly 122 size. I will try the poly first because I have a sneaking suspicion that I will be experimenting for a while and doing multiple disassemblies. I just can't, in the end, leave sh!t alone.
 

Create an account or login to comment

You must be a member in order to leave a comment

Create FREE account

Create a FREE account on our community. It's easy!

Register

Log in

Already have an account? Log in here.

Trending in this forum

Back
Top