This is a genuine replacement part produced by original manufacturer. It is found in assorted models of Bostitch nailers. An O-ring prevents pressure loss by creating a flexible seal between rigid parts. Many tools use different sizes/shapes of O-ring throughout, so ensure that correct one is used. Sold individually.
I disassembled the gun carefully to see how each part works & to reassemble gun,
After cleaning gun, I put on the new parts & it nailed perfect. This gun is about 30 years
old & thank you for still having the parts!
Laid out a towel on the kitchen table. Disassembled. Cleaned (everything was filthy). Replaced old parts with new ones. Reassembled. Worked like a champ.
Remove head of gun, 4 allen screws,slide out driver ,put new o ring on new driver replace driver ,nailer head and 4 screws. drive out pins of trigger valve,replace with new valve replace pins. make sure new valve goes in like the old one came out. make sure seated all the way in.
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Model Cross Reference
This part works with the following models:
ERP Number: ERP12504752
Manufacturer Part Number: 851439
This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
New stock is on the way! On order parts usually ship within 7 business days.
Item is not in stock and usually ships 10-15 business days from the time you place your order.
This item is no longer being made by the manufacturer, and cannot be added to your shopping cart.
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Mail-In Recycling Rebate
Some of the parts we sell are eligible for mail-in rebates since we can recycle them. We will display any applicable rebates in your shopping cart. To redeem your rebate, contact Customer Service after you have received your part.
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