Hitachi 878417 Replacement Part for Power Tool Exhaust Valve

My old nailer is running again by just replacing this small plastic exhaust valve. Saved lots of money doing it myself.

Great replacement valve

It fit just perfect and it was the same design as the one I need it . When I took the staple gun apart I noticed this part was cracked so I ordered one (this one) and installed it, now it work just like new. With out this part the piston wouldnt go back up.

Used it for a roofing gun

A+

Working good thanks