Easy
15-30 minutes
Genuine Manufacturer Approved replacement part designed for certain Nailers. This part is made out of Rubber Material and it is sold individually. The purpose of this part is to create a seal so air does not leak from the gun. When replacing this Seal it is advised to inspect all of the other Seals and O-Rings for wear.
Seal N925911
OEM part for: DeWALT, Porter Cable
Part Number: N925911
$5.48
In Stock
Order within the next 12 hours and your part ships today! 
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Frequently Purchased Together ?
Compatibility
This part will fit the following 6 machines
DeWALT
D51257 16 Gauge Finish Nailer View Diagrams & Manuals
D51257K Type 1 16 GA Finish Nailer View Diagrams & Manuals
D51257K Type 2 16 GA Finish Nailer View Diagrams & Manuals
Porter Cable
FN250C Type 1 16 Ga. 2-1/2" Finish Nailer Kit View Diagrams & Manuals
FN250C (Type 2) Finish Nailer Power Tool View Diagrams & Manuals
FN250C (Type 3) Finish Nailer Power Tool View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Nailer Parts
This part replaces obsolete part #: 647950-00
Customer Part Reviews ?
Average Rating (out of 5):
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Quicker than expected shipping
I didn't need it, when I opened my nailer up and saw the split seal I assumed that was the problem. If you look closely at the picture you can see it's split when new.
Guest -
August 27, 2020
Verified Purchase
Worked great
The parts I purchased were spot on! Good price and fast shipping !
Kevin -
May 11, 2020
Verified Purchase
Porter Cable nail gun fixed
Used this company several times. Great service and the website is easy to use and find the needed parts quickly. 5 stars. Nail gun is fixed. Saved $$$
Guest -
May 5, 2020
Verified Purchase
Easy repair
Your web site help me out tremendously. It gave me the correct information as to what might be wrong with my nail gun. the parts came in in no time fit in place with no problems. It saved me a bunch of money did not have to buy a new nail gun. If I would have brought it to a repair shop it would have cost me probably as much as a new nail gun.
Guest -
December 3, 2019
Verified Purchase
Good job guys..everything worked as expected
Everything fits and works perfect. !
john -
May 23, 2019
Verified Purchase
Corrected the air leak
Part fit fine, USPS delivery was slow.
Guest -
May 18, 2019
Verified Purchase
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t days ago
Verified Purchase
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Nailer would not fire nails.
Michael - April 14, 2017
👍 3 of 3 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Wrench Set
1. Removed the 4 mounting screws with an allen wrench.
2. Removed the piston driver assembly and found that the seal was blown and the driver pin was severely bent.
3. Put o-ring on the piston assembly and covered with replacement seal (part that is white plastic)
4. Re-inserted the driver pin through the guide place while installing the finished assembly.
5. Re positioned the gasket on back and screwed in the cover.
6. Gun now fires like a champ.
2. Removed the piston driver assembly and found that the seal was blown and the driver pin was severely bent.
3. Put o-ring on the piston assembly and covered with replacement seal (part that is white plastic)
4. Re-inserted the driver pin through the guide place while installing the finished assembly.
5. Re positioned the gasket on back and screwed in the cover.
6. Gun now fires like a champ.
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Piston driver assembly snapped, and ring seal broke within cylinder - nailier inoperaboe
Robert - August 19, 2016
👍 2 of 3 people found this instruction helpful
Tool Type
Nailer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Nutdriver
1. Using hex wrench, remove cap from nailer
2. Remove cylinder/driver assembly from nailer housing
3. Remove broken driver assembly & seal from cylinder
4. Place new O-Ring (black) around new driver assembly
5. Wrap new seal (white) around new driver assembly
6. Insert new driver assembly/seal into cylinder
7. Insert cylinder/driver assembly into nailer housing
8. Reattach cap using hex wrench.
9. Ensure that driver is aligned within nose assembly
2. Remove cylinder/driver assembly from nailer housing
3. Remove broken driver assembly & seal from cylinder
4. Place new O-Ring (black) around new driver assembly
5. Wrap new seal (white) around new driver assembly
6. Insert new driver assembly/seal into cylinder
7. Insert cylinder/driver assembly into nailer housing
8. Reattach cap using hex wrench.
9. Ensure that driver is aligned within nose assembly
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Nailer quit nailing
Larry - April 24, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
I pulled the internal shaft out and a seal over an o-ring was broken...I went to the another site and the part was obsolete.....I went to this site and it was available for $8...great , Thanks!! Larry
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Nail driving pin broke and ruined the piston cylinder
Justin - March 31, 2021
Tool Type
Nailer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Allen wrench
1. Removed the four bolts holding on the rear cap.
2. Removed internals.
3. Installed new internals with a light coating of oil.
4. Reinstalled rear cap with new gasket.
2. Removed internals.
3. Installed new internals with a light coating of oil.
4. Reinstalled rear cap with new gasket.
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broken piston driver
COLIN - March 16, 2019
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, allen wrench
Watched "how to repair nailer" on utube.
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Nailer wouldn't shoot nails
Kevin - April 12, 2018
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Allen wrench
Parts Used
1. Disassembled gun
2. Followed directions to replace all o-rings in gun
3. Removed pins holding trigger valve in place
4. Installed new trigger valve
5. Reassembled and tested
2. Followed directions to replace all o-rings in gun
3. Removed pins holding trigger valve in place
4. Installed new trigger valve
5. Reassembled and tested
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Nailer wouldn't fire.
Benita - December 20, 2017
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Wrench Set, A punch and a hammer
Parts Used
Removed the damaged seal. Replaced the seal lining up the pins.
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The piston driver bent and the seal was chewed up.
Steven - July 26, 2017
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Hex wrench
1. Removed the head of the nailer (4 hex screws).
2. Removed the bent piston driver.
3. Installed the new o-ring and the seal onto the new driver.
4. Reassembled the tool.
2. Removed the bent piston driver.
3. Installed the new o-ring and the seal onto the new driver.
4. Reassembled the tool.
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Nailer trigger valve seal was blown
Larry - June 20, 2017
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Nail setter
Parts Used
After taking nailer apart I figured to replace seal would be smart to do. I used the nail setter to remove pins to replace trigger valve assembly. After removing the worn trigger valve assembly it was easy to install new trigger valve assembly. Hooked to air hose and it worked like new...
Thank you for the prompt delivery and correct parts,
Thank you for the prompt delivery and correct parts,
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Nailer was missing the gasket I purchased from you.
Eugene - April 21, 2017
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
Removed screws from head unit.
Pulled plunger out.
Installed the new seal
Tried to fire it twice.
Nails started firing after third shot.
Works great now!!
Pulled plunger out.
Installed the new seal
Tried to fire it twice.
Nails started firing after third shot.
Works great now!!
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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.
