Take a few different ones of the same thickness and squeeze them. Pretty quickly you will be able to distinguish between 70 and 90 durometer.
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Air Venturi Avenge-X O-Rings
- Thread starter M Volle
- Start date
Found this chart and wonder if the o ring numbers are a guide to what we have in the Avenge X? ie; #77 & #79
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You need a caliper to measure the o-rings or compare the old one with the new ones -
In my gun there were a number of o-rings that were so deformed or stiff that they broke when trying to remove them - that makes using a caliper really helpful - even if its a cheap plastic one, you can measure the new ones and check against the drawing
The shore 70 and 90 rings are quite different if you have both to compare - the 70's are much softer than the 90's but it takes a little comparing squeezing them between your fingers to get a feel for the difference.
Some sizes are only included in 70 or 90 - so those are easier to tell if you measure - it will just be the correct shore number.
I reassemble with a little pure silicone oil -
I was looking at the wrong o-ring when you asked about replacements - the #79 ring is 2cs x 5mm ID and can be bought at this link -
PyramidAir does sell the regulator o-rings 74 and 77 but its expensive for just two o-rings. You will replace them at some point and 74 is tough to install - I made a small cone shaped tool to sit on the regulator stem and slid the ring down into place but it can be done by hand. #74 is the size I haven't found in bulk.
I know from experience that if you accidentally put shore 70 rings on the axle (#79 rings) it will leak again quickly -
In my gun there were a number of o-rings that were so deformed or stiff that they broke when trying to remove them - that makes using a caliper really helpful - even if its a cheap plastic one, you can measure the new ones and check against the drawing
The shore 70 and 90 rings are quite different if you have both to compare - the 70's are much softer than the 90's but it takes a little comparing squeezing them between your fingers to get a feel for the difference.
Some sizes are only included in 70 or 90 - so those are easier to tell if you measure - it will just be the correct shore number.
I reassemble with a little pure silicone oil -
I was looking at the wrong o-ring when you asked about replacements - the #79 ring is 2cs x 5mm ID and can be bought at this link -
2mm X 5mm (NBR) Buna-N 90 Duro Metric O-Ring [H2.00X005] : The O-Ring Store LLC, We make getting O-Rings easy!
The O-Ring Store LLC 2mm X 5mm (NBR) Buna-N 90 Duro Metric O-Ring [H2.00X005] - Metric O-Rings - Cross Section "CS" X Inside Diameter "ID" Nitrile, Buna-N O-Rings (NBR): Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle. It is the most commonly used elastomer...
www.theoringstore.com
PyramidAir does sell the regulator o-rings 74 and 77 but its expensive for just two o-rings. You will replace them at some point and 74 is tough to install - I made a small cone shaped tool to sit on the regulator stem and slid the ring down into place but it can be done by hand. #74 is the size I haven't found in bulk.
Air Venturi Avenger Regulator O-Rings | Pyramyd AIR
We've got a great price on Air Venturi Avenger Regulator O-Rings at Pyramyd AIR. Shop where the experts do!
www.pyramydair.com
I know from experience that if you accidentally put shore 70 rings on the axle (#79 rings) it will leak again quickly -
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So...Ive rebuilt 3 Avg .25 in the last few weeks. Are you sure your leak is at that spot? I have replaced every single oring that touches are on that gun. As soon as I would replace a set and try it would leak but it turned out to be from different spots each time. All guns now hold full pressure perfectly and back to performing flawlessly. Pyramyd sells the oring kits for $40 for a full gun. The oring on the reg stem is a special sized one in which only Pyramyd air has but I found an alt thats very close and is currently holding fine.
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You are 100% correct!You need a caliper to measure the o-rings or compare the old one with the new ones -
In my gun there were a number of o-rings that were so deformed or stiff that they broke when trying to remove them - that makes using a caliper really helpful - even if its a cheap plastic one, you can measure the new ones and check against the drawing
The shore 70 and 90 rings are quite different if you have both to compare - the 70's are much softer than the 90's but it takes a little comparing squeezing them between your fingers to get a feel for the difference.
Some sizes are only included in 70 or 90 - so those are easier to tell if you measure - it will just be the correct shore number.
I reassemble with a little pure silicone oil -
I was looking at the wrong o-ring when you asked about replacements - the #79 ring is 2cs x 5mm ID and can be bought at this link -
2mm X 5mm (NBR) Buna-N 90 Duro Metric O-Ring [H2.00X005] : The O-Ring Store LLC, We make getting O-Rings easy!
The O-Ring Store LLC 2mm X 5mm (NBR) Buna-N 90 Duro Metric O-Ring [H2.00X005] - Metric O-Rings - Cross Section "CS" X Inside Diameter "ID" Nitrile, Buna-N O-Rings (NBR): Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle. It is the most commonly used elastomer...www.theoringstore.com
PyramidAir does sell the regulator o-rings 74 and 77 but its expensive for just two o-rings. You will replace them at some point and 74 is tough to install - I made a small cone shaped tool to sit on the regulator stem and slid the ring down into place but it can be done by hand. #74 is the size I haven't found in bulk.
Air Venturi Avenger Regulator O-Rings | Pyramyd AIR
We've got a great price on Air Venturi Avenger Regulator O-Rings at Pyramyd AIR. Shop where the experts do!www.pyramydair.com
I know from experience that if you accidentally put shore 70 rings on the axle (#79 rings) it will leak again quickly -
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I had some early leaks and then an odd failure - at about 3500-3800 lbs while filling, the burst disk on the gun blew out - this seemed to create a cascade of failures - couldn’t even begin to build pressure with my little compressor and it clearly wasn’t a single point - that prompted the first complete tear down - the reg was leaking, the axle and the bottle seat - probably more but those were the big ones - then chased little leaks until I found them all - including a scratched seat where the poppet valve sat that was very slow but was leaking - the larger ring in the regulator has gone several times but I’m shooting at 175-180 bar most of the time - Vitron rings in the reg have been holding better and haven’t failed yet- stock small compressor with the little in line filter was probably allowing at least some water in - solved that as well and the gun has been stable since - will be doing a post on a simple solution for little compressors - initially I found a lot of brittle and deformed o- rings so ended up replacing all of them - and a few mistakes along the way -
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Yes, most the orings are junk. Hard and flat. Our 3 went out after about a year. Too good of a gun to not keep though and now I feel like an expert lol. Had them apart so many times. I now have tons of orings for the entire gun. The other place that leaks is the fill nipple and the air cylinder into the block. The fill nipple is the 2nd hardest one to change. I need to make a tool for that. The 1st is the poppit guide oring in the valve.
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