rebuilding hitachi nr83aa- ripped cylinder ring

[629260]

I have to replace the cylinder ring on this nail gun, but since it was ripped i'm not sure where it goes on the cylinder. I think it goes over where the small holes are?

[Tinkerdave]

Hi, Yes it goes over the holes and is a cylinder check valve for return air. Nail guns use low pressure to pull the piston driver assembly back up to the top of the cylinder and this check valve helps it do that. Hope this helps.