Bostitch Nail Gun Repair - How to Replace the Head Valve O-Ring

Need help replacing the Head Valve O-Ring (Part # 180535) in your Bostitch Nailer? Watch this how-to video with simple, step-by-step instructions for a successful DIY repair.
Don’t already have this part? You can pick up an authentic OEM part sourced directly from the original manufacturer here:
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Fix Part Number: FIX10247049
OEM Part Number: 180535
Why you might need to replace the Head Valve O-Ring:
1. O-Ring Hardened or Cracked
2. Leaking Air
The information in this video is specific to Bostitch Nailers. To find a Head Valve O-Ring specific to your model Nailer, or to use our helpful model number locator, visit www.fix.com
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[@LarryMar]

After being put away for a decade, my gun fired one nail then just blew air out the back. I took apart the head to replace the o-rings but found my whole head-valve-piston cracked into a hundred pieces (the o-rings still looked good). My valve was black and not white like shown in the video. I'm trying to decide to order parts or buy a new one. I think I purchased the gun back in 2005.

[@marknye51.thefixitguy]

Question again.. what cause the plastic valve head piston to shatter or fall apart.? Part # 180540-s . I have two older craftsman tools and both have the same valve head and both are broken. I have had these same type of older craftsman pneumatic nailers and have never had one fail. Model # 351.181740

[@LarryMar]

Mine just did.

[@turbomundo1]

When dude makes our eyes bleed while he removes every damn bolt and he finally chucks the wrench out of frame...we're feeling ya dude