CO2 o-ring question
 
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CO2 o-ring question

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(@jim_in_pgh)
Pennsylvania
Joined: 7 years ago
Posts: 1015
Topic starter  

What is the correct size and material for a Crosman piercing endcap?  I'm currently using buna-n, which seals just fine and holds forever, but I have to let the o-ring de-gas for about 15-20 minutes before it will fit back into the gas tube.

(BTW, this is on a CR187 that has been converted to dual-cart, with a CR400 pressurized gas tube, and a CR160 piercing endcap.)


   
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marflow
(@marflow)
Washington
Joined: 7 years ago
Posts: 1594
 

well all o-rings that come in to contact with CO2 needs to be Urethane 

most other material will absorb the CO2 and have the problem you have noticed 

i believe the size is a 113 9/16 ID 3/4 OD 3/32 CS 

it is part 150-54 or 150-054  

https://www.theoringstore.com/store/index.php?main_page=product_info&cPath=367_1321_1324&products_id=27507

now they have several different type of urethane Cast and other 


   
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