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Help with a Crosman 451 stem and seat assembly problem.
https://www.airgunforum.ca/forums/topic74196-15.html
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Author:  Ace [ Mon Nov 07, 2016 12:29 pm ]
Post subject:  Re: Help with a Crosman 451 stem and seat assembly problem.

glad you got R done... 8)
many times a small imperfection on the valve face were the seal sits will cause very small leaks
tiny particles traveling with the co2 gas can lodge themselves and cause a crevice there and also on the stem seal face
that's why many air guns have a filter or screen just after the co2 cart...big leaks are usually the valve stem seal a small
tiny hiss is likely particles in the seal or the seat has an imperfection... :wink:

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