Easy
15-30 minutes
This is a manufacturer sourced replacement part designed for use with Senco staplers. This is one of the seals for the valve. Over time it will shrink, become brittle and crack allowing for air leaks. At that time it should be replaced. It is made out of rubber material and it is sold individually.
Replacing this item you would need hex key/allen wrench and pliers to replace this item.
Seal LB3505
OEM part for: Senco
Part Number: LB3505
$9.77
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 0.01 lbs.
- Shipping: Ships Worldwide
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Compatibility
This Seal will fit the following 53 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 20 of 53 matching models.
53 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- Senco
This item works with the following types of products:
- Nailer
- Stapler
Customer Part Reviews ?
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Nail gun parts
Every thing is fine except the option paid for quicker shipping. The items arrived the same time as ground would have.
Guest -
September 30, 2019
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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.
Senco frame Nailer
John - January 31, 2024
Tool Type
Nailer
Difficulty
Hard
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Adjustable Wrench, Metric / SAE allen wrench set. Ratchet.
Parts Used
Disassembled nailer. Replaced all the broken parts. Replaced the o-rings, found that 2 of the o-rings were the wrong size from the kit. Got the correct o-rings. reassembled the nailer and it failed to work. I did follow the instructions in the kit. Still have the nailer on the bench working on the 3rd tear down.
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Seals were deteriorated
Christopher - October 18, 2023
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Wrench Set, Allen keys
Disassembled the nailer, removed old parts, cleaned, lubticated, and reassembled the nailer.
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Air leaking from the top.
Sisira - August 25, 2023
Tool Type
Nailer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Power Drill, Nutdriver
Parts Used
1) Removed the 4 X 5mm Allen screws on the top.
2) Removed the piston, it had 2 seals cracked.
3) Replaced them with new ones.
4) Assembled back the piston.
5) Closed up the top with the 4 Allen screws.
2) Removed the piston, it had 2 seals cracked.
3) Replaced them with new ones.
4) Assembled back the piston.
5) Closed up the top with the 4 Allen screws.
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seal in piston
doug - February 26, 2019
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, allen wrench
removed 4 allen screws and pulled head and replaced seals (4) in piston
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Leaks air
Edward - December 28, 2017
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Parts Used
Replaced the worn seals.
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Bad seal
Dana - May 30, 2017
Tool Type
Stapler
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen wrench
Parts Used
Removed the end cap, removed the worn seal. Then installed the new seal. Put the cap on, tightened the screws
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Air was leaking very badly from top.
Steven - May 19, 2017
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Parts Used
Removed the four top cap allen screws, blew all the pieces of old retainer from nailer body, replaced seals and retainer not using any tools, then reassembled nailer.
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leaking air from top, not firing.
Stephen - March 3, 2017
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Hex Wrench Set
Using a 5mm hex wrench, remove the four screws from top of the nail gun. Be a little careful, as there is a spring in the assembly that will push the top of the gun off. I used a schematic I printed from the Senco website to identify the broken parts and determine the correct reassembly order. Otherwise, just remove one o-ring or seal at a time and replace with the one from the kit. It seems that this kit is designed for multiple tool models so you will have a few parts left over. The challenge in the reassembly was figuring out that large outer seal on the aluminum chamber had to be installed in the gun body and the tube the installed.
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Broken seals
carl - September 3, 2016
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Parts Used
Took head off nailer and replaced 3 seals.I then clean the nail gun through out and oiled it. Then attached the head.
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Leaking air
Tommy - April 14, 2016
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Nutdriver
Parts Used
Removed the end cap of the gun, pulled up the piston/driver and replaced the seal on it. The replaced the seal on the valve. Oiled the inside of the gun. Then reattached the top cap. No more leaks.
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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.
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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.
