Your LockNLube^® Grease Coupler will not leak after attaching to a grease fittings. The leak-proof seal is created by a rubber seal that sits inside the jaws and pushes against the grease fittings when your grease gun is pressurized. If you have burs on your fittings, or after a lot of regular use, this rubber seal may begin to wear out and start to leak.

When this happens, it’s time to swap out the jaws and seal for a new set. A free replacement set is included with each LockNLube^® Grease Coupler. If you have lost yours, or need another, you can visit our online store.

If you’d rather watch a video than read the instructions below, check out our video tutorial on how to change the seal kit. Otherwise, read on…

Ready to swap out your seal and jaws for a fresh set? Here is what you need to know:

1. The most important thing to remember is that it is OK to ruin the jaws that you’re removing. You may have to crank hard on the old seal and jaws to get them out, but don’t be afraid to really squeeze them.
2. We recommend grabbing the bottom of your grease coupler, behind the trigger in a vise for better grip, but you may be able to swap out the seal without a vise.
3. Push the trigger down so that the jaws are exposed. Grab the jaws tightly with a pair of vise grips. Twisting counter-clockwise will remove the jaws and threaded cone from your coupler.
4. Grab your new seal and threaded cone. The jaws have a larger end and a smaller end. Seat the smaller end in the groove on the the threaded cone.
5. Holding the jaws around the cone with your finger, depress the thumb lever on your grease coupler and thread the new cone in. Finger tighten, then snug up with pliers. Don’t squeeze too hard on the new jaws, you’ll need them!

If you have any issues, call us at 603-795-2298 or email info@locknlube.com.