Easy
15-30 minutes
This replacement o-ring is a high quality item that is sourced from original equipment manufacturer for use on Porter Cable nailers. This o-ring provides an air-tight seal for the piston driver assembly. Over time o-rings tend to shrink, become brittle and crack allowing for air leaks eventually requiring replacement. Please note one durable rubber o-ring is included per order.
O-ring 908890
OEM part for: Porter Cable
Part Number: 908890
$4.99
In Stock
Order within the next 5 hours and your part ships today! 
Jump To:
Frequently Purchased Together ?
Compatibility
This part will fit the following 4 machines
Porter Cable
RN175 Type 1 Roofing Nailer View Diagrams & Manuals
RN175 Type 2 Roofing Nailer View Diagrams & Manuals
FN250A Finish Nailer View Diagrams & Manuals
FN250A (Type 1) 2 1/2in Finish Nailer Power Tool View Diagrams & Manuals
This item works with the following types of products:
- Nailer Parts
Customer Part Reviews ?
Average Rating (out of 5):
Click to filter by ratings:
5 stars
5
4 stars
0
3 stars
0
2 stars
0
1 stars
0
< PREV
- 1
Parts worked as described. Fast shipping
Replacement nail gun bump stop.
Guest -
March 21, 2023
Verified Purchase
The customer service that I received over the phone was great. The gentleman that helped me was very knowledgeable.
The three parts we ordered arrived on time and worked perfectly.
Guest -
August 31, 2022
Verified Purchase
Successful repair
The parts I ordered were exact replacements needed to repair my Porter Cable 16 gauge nailer. I purchased it in December of 2000 and it has had a lot of use. I was concerned that I would have to throw it away. These parts enabled me to get the nailer working as good as new again!
Guest -
March 28, 2022
Verified Purchase
everything fit
parts fit great
i order my parts by phone
have person who takes the order, speak loud and slow,and repeat the order ,before hanging up,,
most of the time ,they are very good
Mike -
January 19, 2022
Verified Purchase
seem to always have to parts I need
you nearly always have the parts I need, even tools from the '70s! Not all but what I needed.
Guest -
April 14, 2020
Verified Purchase
t
t
t -
t days ago
Verified Purchase
eReplacementParts Team
t
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
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.
Does this fit my product?Questions & Answers for O-ring
No questions have been asked yet
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.
Finish Nailer leaker air through the top vent
Conrad - March 28, 2021
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Hex wrenches
This nailer is about 17 years old and has seen a lot of use. The last time I used it is work for a couple of trigger pulls and then began leading air through the top vent and stopped driving. I did some research on the repair and then went to the manufactures web site, but they no longer carried any parts. All the parts I needed I got from eReplacment parts.
Disassembly was fairly simple. The piston was stubborn to remove but a sharp rap on a wooden block did the trick. Checked all the parts for damage and found that the spring bumper was broken in several places. Ordered that part and replaced all the seals since the unit was apart. Recommend lubricating each seal and its mating part before reassembly. A good cleaning of the tool is also recommended along with oiling other areas with moving parts. Works great. Recommend about 80-85 psi when operating brad and finish nailers.
Disassembly was fairly simple. The piston was stubborn to remove but a sharp rap on a wooden block did the trick. Checked all the parts for damage and found that the spring bumper was broken in several places. Ordered that part and replaced all the seals since the unit was apart. Recommend lubricating each seal and its mating part before reassembly. A good cleaning of the tool is also recommended along with oiling other areas with moving parts. Works great. Recommend about 80-85 psi when operating brad and finish nailers.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Air coming out at the back of the gun
Pascual - September 10, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed the cylinder cap, removed the old gasket, removed the o-ring from the piston and installed the new one. Placed the new gasket on the gun and installed the cylinder cap.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Leaking air and not firing
Johann - September 9, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Removed the four allen head screws from the cylinder cap and removed it
Removed the cylinder and cleaned the inside of the gun
Installed all of the o-rings, piston stop and gasket
Oiled the insides of the gun
Replaced the cylinder cap
Removed the cylinder and cleaned the inside of the gun
Installed all of the o-rings, piston stop and gasket
Oiled the insides of the gun
Replaced the cylinder cap
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Piston stop broke
Robert - February 23, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver
Took off the top, put in the new stop, lubed and replaced the top.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Nailer won't fire, only leaked air while the trigger was depressed in the trigger area
Michael - February 16, 2019
Tool Type
Nailer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Socket set, Wrench Set, Dental Pick
Disassembled the trigger and then removed the trigger valve from the body of the gun using a socket. I replaced all of the O-rings in the trigger area and lubricated them with the oil that comes with the gun. I then reassembled the valve and screwed it back into the gun body. I reassembled the trigger making sure that the safety worked as it is designed to. The gun worked properly after the repair and continues to at this point. I am satisfied that the O-rings were the cause of the problem.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
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.
Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
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.
