The o-ring attaches to the valve. This item is available as an individual replacement part. It is an authentic DeWALT replacement part that is sourced from the original manufacturer for use with nailers. It is made of rubber and will need to be replaced if it breaks.
O-ring 398164-00
OEM part for: DeWALT
Part Number: 398164-00
$4.99
In Stock
Ships within 1 business day 
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Compatibility
This part will fit the following 6 machines
DeWALT
D51256 Type 1 Finish Nailer Kit View Diagrams & Manuals
D51256 Type 2 Finish Nailer Kit View Diagrams & Manuals
D51256 Type 3 Nailer View Diagrams & Manuals
D51256K (Type 1) Angled Finish Nailer View Diagrams & Manuals
D51256K (Type 2) Angled Finish Nailer View Diagrams & Manuals
D51256K (Type 3) Angled Finish Nailer View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Nailer Parts
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Got the parts and they worked perfectly. The nail gun is back online. EVERY time we order from you, the parts are exactly what I needed. If you don’t have the parts, they are not to be gotten anywhere. You keep great stock. THANKS!
Martha -
February 1, 2022
Verified Purchase
O ring trim gun
The part fixed the problem, but had to call the 800 number to ensure that was the correct one since my gun didn’t match there schematics.
Guest -
June 16, 2021
Verified Purchase
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OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
