Question about Air Tools & Compressors

2 Answers



Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has written 7 tips or uploaded 3 video tips

  • Master
  • 859 Answers

Please do not rate this until we've finished our dialog. Okay?

Do you see an oil port or small hole in and around the trigger?

The trigger that you use to actuate the gun operates a plunger diverting air from a the storage chamber into the barrel. This plunger usually has a least one and usually two o-rings. If there is an oil port or small hole on the body above the trigger and either forward or to the rear of the trigger, this may lubricate the plunger enough to revitalize the o-rings and create air from the storage chamber escaping at the trigger.

O-rings do shrink in a drier climate should you be in one. They also shrink over time. Lastly, you may have one with a tear in it and this could also cause the leak.

As I seem to recall Bostitch is one of those companies that encourages their equipment be returned to a factory service center. And air guns being somewhat dangerous this would normally be the case.

Can you supply the model version and perhaps I can also provide you with a parts explosion that will show you the elements to access should you desire to undertake the replacement of the o-rings yourself.


Posted on Sep 29, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 171 Answers

Replace the trigger valve assembly (TVA).

Posted on Sep 29, 2008

  • 1 more comment 
  • Todd Gale
    Todd Gale Sep 29, 2008

    If you go to the link below you can select your model number and you will see the parts list and instructions for the repair. It is not that difficult. If you provide me with the model number, I will get you the information.

  • Todd Gale
    Todd Gale Sep 29, 2008

    Worldvet, please do not answer questions you are not qualified to answer. This is a dangerous repair if not handled properly and your answer about replacing an o-ring is not correct and could cause this person to suffer injuries. Stanley/Bostitch makes their repair procedures available to the enduser and does not require any such repair policy. I would appreciate you not answering posts you are not qualified to just for the sake of making a few dollars. I will report your actions in the future.

  • Todd Gale
    Todd Gale Oct 03, 2008

    Please rate this solution.


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Bostitch just blows air when trigger is pulled

Air leaking from trigger when attempting to fire the gun is normal and should cause nailer to fire, however if the trigger pin is not depressed all the way in,the gun may not respond. Easy test. Remove the nails and remove the trigger. Connect the gun to air and quickly depress the valve pin all the way in with finger. If the gun fires, adjust the safety foot so that the trigger pin is depressed all the way in. If the gun still does not fire, then remove the head cap and pull out the headvalve. Apply plenty of white grease to orings and retest. If the gun fires, then replace the headvalve orings. When the headvalve orings are worn, air will leak from bulkhead chamber to the headvalve chamber causing the gun to not respond to the trigger. The addition of grease to worn orings will make them temporarily seal. Good luck

Jun 16, 2016 | Stanley Bostitch N66c1 114"to 212" Coil...

1 Answer

Internal air leak won't pressure up

Sounds like the trigger valve is bad. If the air is leaking out of the trigger you can buy a kit and replace it. Try eReplacementParts com or your local Bostitch service store. It's really simple to change, check out this site for step by step, How To Replace The Trigger Valve On Bostich Nail Gun How To Guides DIY... OEM Replacement Parts DIY Repair

Mar 17, 2014 | Stanley Bostitch SB1850BN 18Gauge Brad...

1 Answer

I have a Bostitch N88RH stick nailer with contact trip. For some time, when I connected the nailer (without actuating the trigger or tip), it would fire a nail. Now, it will often fire a nail when first...

Usually, if you change the trigger valve (TVA11) the nailer will function as before. This problem could be also be caused by air leaking past the orings in the headvalve (3 orings). Easy to check. Remove the head and pull out the headvalve (white plastic piston). Look carefully at the cylinder where headvalve orings make contact and look for smooth surface. If scratched or deep groove, replace head or try to smooth out with fine sandpaper. You can make the orings fit more snuggly against the cylinder by using one or two turns of Teflon tape under the oring (just the outside orings). Apply white grease and replace head to test.
As for the trigger valve, remove the trigger to expose the valve. Check if the trigger pin moves from side to side or seems loose. If it seems loose replace the valve. If the valve has a metal pin (many have plastic (metal better)), you can pop out the valve and just replace the orings on the inner plunger. If plastic pin replace the valve. To remove the valve, remove the roll pins in the body of the gun (3mm) and apply air pressure to the gun. Use lower pressure than normal and use a glove or bunched up shop rag to catch the valve as it is pushed out by the air. Could come out with force depending on the pressure. Note the slots on the valve as they relate to the roll pins so you can reinstall correctly. Good luck.

Sep 01, 2013 | Stanley Air Tools & Compressors

1 Answer

Air is leaking at the trigger on a Bostitch 80s b1

Your nailer uses a trigger valve (could be part # tva6 cost about $20, need to look up) and is sold at or generic valves sold on ebay . If you have a source for orings, you could try to repair the valve. Remove the roll pin that holds the trigger to expose the tva6 valve. There are roll pin/pins that hold the valve in just above the valve in the body. Remove these pins and apply air pressure to gun to pop-out the valve. Use caution when you do this. Remove nails, lower pressure to gun and use glove or rag to catch valve because it could come out with force. With tva6 valve in hand remove two pins that hold valve together and remove inner plunger. The middle oring on plunger is cause of leak. Try using an oring about same size as the broken seat. It must fit pretty tight to work. If you had a small leak it could be that the firing pin orings fit too loose or just too worn. Use silicone lube or oring lube on the orings and the valve port. Good Luck on your repair and email if you have other questions

Oct 06, 2010 | Stanley Bostitch N80s Nailer -rebuild...

3 Answers

I have a bostitch ridge runner that leaks air badly out of the trigger and wondering how to take out the plastic trigger in the gun. Also what would be the cause of the air leak

The air leak can be one of a few things. FIrst make sure that you have added some pneumatic oil to the air stream. This will lubricate the o-rings and make a tight seal. If that fails to resolve it, repalce the o-rings. (kits available for around $20). Next, woul dbe the trigger assembly itself. These triggers wear over time and are easily replaced.

See the website below for parts and a good diagram of the construction of the gun. You should be able to replace the parts by following the diagrams.

Please note that the exactmodel number is required to get hte correct diagram.

Hope this helps,

Jul 12, 2010 | Stanley Factory Reconditioned Bostitch...

1 Answer

Leaking air when trigger is depressed

This is an indication of a defective seal. Try adding a little pneumatic oil to the gun and triggering it a few times. Sometimes all it is is a small leak in the o-ring because of a lack of lubrication. If not, then try replacing the o-rings (kit available for around $20). The next possibility is the trigger itself. I have replaced the trigger assembly on mine once thus far.

Good luck,

Jul 06, 2010 | Stanley Bostitch FN16250K - 2 16 - Gauge...

1 Answer

Air leaking near trigger

the purple O ring is split I would take it back or if you want to try and fix yourself let me know and I will help

Sep 30, 2009 | Stanley Factory Reconditioned Bostitch...

1 Answer

Stanley finsish nailer and air is leaking through the trigger as.

If the air is coming out the trigger it must be replaced. Depending on the model of gun you will have to replace the trigger assembly or various o-Rings. Find a Bostitch dealer in your area and they will supply the parts you require.

Jul 14, 2009 | Stanley Bostitch FN16250K - 2 16 - Gauge...

1 Answer

Constant air leak

Sounds like you need a repair kit or take to a tool company that installs the kit.

Jun 09, 2009 | Stanley Bostitch Coil Framing Nailer

3 Answers


sounds like the rubber seals have dry rotted prob from not oiling it enough, but you should be able to go on the Bostitch web site and order new rubber seals for the gun

Sep 29, 2008 | Air Tools & Compressors

Not finding what you are looking for?
Air Tools & Compressors Logo

Related Topics:

583 people viewed this question

Ask a Question

Usually answered in minutes!

Top Air Tools & Compressors Experts

John Trevino

Level 3 Expert

1378 Answers

Brad Brown

Level 3 Expert

13819 Answers

james allen
james allen

Level 2 Expert

109 Answers

Are you an Air Tool and Compressor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides