( Grid squares measure 1x1 inch )

SEAL 904689

Manufactured by:: DeWALT
ERP Number:: ERP18987982
Part Number:: 904689

$16.85

★★★★★

32 Reviews

Delivers in 3-5 Business Days!

Easy

15 - 30 mins

(52 rated repairs) ?

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Description Frequently Purchased Together Troubleshooting Reviews Questions & Answers Repair Instructions Model Cross Reference

Product Description

Genuine Porter Cable replacement part, this item is sold individually. The Head Valve Seal is in stalled on top of the 904695 Cylinder. It provide a seal for the Head valve. If you air leaks in your nail gun you may consider the part number 904949 Overhaul Kit.<rb> It includes the Head Valve Seal and other internal parts to stop air leaks

Frequently Purchased Together

HEAD VALVE BODY

★★★★★

(147)

$6.16

O-RING

★★★★★

(56)

$7.39

Minimum Quantity of 2 required

O-RING

★★★★★

(9)

$6.02

Minimum Quantity of 2 required

PISTON STOP

★★★★★

(11)

$38.70

HOUSING CAP

★★★★★

(17)

$51.83

O-RING (29.5 X 2 (S3

★★★★★

(5)

$9.13

Minimum Quantity of 2 required

PISTON RING

$15.76

$13.02

PISTON RING

★★★★★

(4)

$17.25

PAD

★★★★★

(5)

$14.63

O-RING (31 X 2 (2031

★★★★★

(1)

$10.22

GASKET

★★★★★

(1)

$24.98

WASHER-BEARING

$6.16

Minimum Quantity of 2 required

Troubleshooting

This part works with the following brands:

Porter Cable

This part works with the following products:

Nailer

Part# 904689 replaces these:

904689,

★

Customer Part Reviews

4.9

Average Rating (out of 5):

★★★★★

(32 Reviews)

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★★★★★

Easy repair

Arrived quickly and accurately. Quick and easy repair

Guest - July 15, 2019

Verified Purchase

★★★★★

Easy repair

Received the part within 3 days of order and it fixed my pneumatic trim nailer immediately. The pre-order operational question you asked ensuring that I was ordering the correct part was interesting, it was something I've never previously encountered when ordering parts, it's a great feature for customers. Thanks!

Guest - September 4, 2019

Verified Purchase

★★★★★

Easy repair, great part, works great!

The part worked great! The nail gun works wonderful!

Guest - September 9, 2019

Verified Purchase

★★★★★

right part

worked great

Guest - September 12, 2019

Verified Purchase

★★★★★

Quick fix on broken nail gun

I watched a you tube video and decided I can do this. So I ordered the part from ereplacementparts.com and the part showed up quickly. My repair took less than 10 minutes of my time and saved me over $75 by doing it myself.

Guest - September 24, 2019

Verified Purchase

★★★★★

Easy, fast

Great site and excellent service.

Ryan - March 14, 2023

Verified Purchase

★★★★★

Great service!

Staff was very supportive from diagnosis to repair. Kept me posted on status throughout. Will gladly work with ereplacement again!

Guest - April 25, 2023

Verified Purchase

★★★★★

Great part!

The part arrived in a timely manner, and worked perfectly.

Derek - October 4, 2023

Verified Purchase

★★★★★

Easy valve seal install. Leaking, hissing nail gun issue resolved.

Part arrived quickly.

Guest - November 6, 2023

Verified Purchase

★★★★★

Easy repair

After several years of non-use I started a project that using my Porter Cable nail gun. After driving 4 or 5 nails, it stopped working. Local tool shop said it would be between $80 and $150 to fix. Watched a video, ordered the $14 part and the gun was back working in less than a week. Great service from eReplacements.

Guest - June 11, 2024

Verified Purchase

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Questions & Answers

Ask our Team

We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.

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Nailer is leaking air out of the back/top. What parts do I need to replace to fix it?

Marcus For model number FN250B - December 3, 2023

Hello Marcus, Thank you for your inquiry. We would recommend checking the head valve seal, piston stop, and o-rings. We have also included a link to our repair article on troubleshooting this issue for your nailer. Good luck with your repair. https://www.ereplacementparts.com/repair-center/power-tool/nailer/leaks-air-from-top/

eReplacementParts Team

December 3, 2023

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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.

Easy

15 - 30 mins

(52 rated repairs) ?

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Had air leaking at a rapid rate from the top of the nailer.

Earl from New Orleans, Louisiana

47 of 47 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 15 - 30 mins
Parts Used:: 904689

Unscrew the 4 Allen bolts from the top of the nail gun. The offending part, a seal, was directly under the cap and the original one had deteriorated to the point it was in pieces. I removed all the pieces, cleaned up the entire area and replaced the seal with the new one. Then it was just a matter of putting the head back on and se ... Read more

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Rebuild head valve

Joseph from Riverview, Florida

20 of 20 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 15 - 30 mins
Tools:: Pliers, Screw drivers
Parts Used:: 904689, 904685

The piston stop had hardened and crumbled. I removed the top of the gun by removing the four hex screws. Then the top of the gun comes off and you can take out the piston stop. I also replaced the head valve seal because it is made out of the same kind of plastic. Pretty easy and now the gun works again.

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Seal head valve was dried, cracked and broken

Allen from Melbourne Beach, Florida

16 of 16 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 15 - 30 mins
Parts Used:: 904689

Removed head from gun by loosening and removing 4 screws; removed old cracked and broken seal head valve; cleaned area of all debris; installed new seal head valve; replaced head on gun; tested gun on sample pieces of wood; all worked well.

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Loss of pressure

Gregory from Tallahassee, Florida

11 of 11 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: Less than 15 mins
Parts Used:: 904689

Removed 4 hex screws head of nail gun. Replace damaged/ worn seal. Replace head. Works well!

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The gun would not nail and a lot of air came out of the top

Cynthia from Wimberley, Texas

4 of 4 people found this instruction helpful.

Difficulty Level:: A Bit Difficult
Total Repair Time:: 15 - 30 mins
Parts Used:: 904689, 904685

Removed the cylinder cap from the top of the gun. I then noticed the broken piston stop and loose head seal. I removed all of the pieces of the broken piston stop. and replaced the head seal. Thoroughly cleaned the inside and oiled it. It fires nails like it new.

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Head valve seal deteriorated

George from San Diego, California

4 of 4 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 15 - 30 mins
Parts Used:: 904689

Remove the four screws from the cap. Then you will see the broken seal. Clean out all of the pieces of the seal, then if you think you have them all look again. Install the new seal. And place the the cap back on and secure with the four screws.

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Air was leaking

Jerry from Morganton, Georgia

4 of 4 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: Less than 15 mins
Parts Used:: 904689

Remove head, located defective seal, remove the old one , then replaced it with the new seal. Check all other parts for wear. Installed head back on. No air leaks!

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Seal broken

Larry from Marietta, Georgia

1 person found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 15 - 30 mins
Parts Used:: 904689

Removed the four screws from the top cap of the nail gun.
Removed the broken pieces of the seal and installed the new one, then oiled the internal parts. Then installed the four screws to the top cap

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Head seal split blowing air

michael from San Mateo, California

1 person found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: Less than 15 mins
Parts Used:: 904689

Removed 4 allen screwd, pulled head seal on top put little oil replaced head and allen screws.
Good as new

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Non-metalic internal parts disintigrated

Michael from Port Orange, Florida

1 person found this instruction helpful.

Difficulty Level:: A Bit Difficult
Total Repair Time:: 15 - 30 mins
Parts Used:: 904689, 904685

1. Disassembled Nailer
2. Removed debris, residue and broken parts
3. Installed new parts.
4. Applied pressurized air and tested for correct operation.
5. Test failed. Nailer drove one nail, but did not reset. All air pressure lost.
6. Disassembled Nailer again.
7. Installed parts correctly.
8. ... Read more

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Model Cross Reference

This part works with the following models:

ERP Number: ERP18987982
Manufacturer Part Number: 904689

Brand	Model Number	Description
Porter Cable	FN250B	Nailer - 16 Gauge Finish Nailer
Porter Cable	FN251	Nailer - 53444