With the McNaught, pressure is what keeps the coupler locked. If you put it on a fitting without pressurizing, it will pull off easily.

Nice video I’ve seen nothing but good things about the lock n lube I like that it comes with a rebuild kit

I just ordered the Lock N Lube off eBay this evening.

Hi. Thanks for the info on the grease couplers. I am a bit late to make a comment, because I am just about to buy one. So checking out reviews. I think the Lock n Lube is the goer for me. But one thing that really interests me about grease couplers is how the seal is made (and I don't mean how they are manufactured) on the top of the zerk surface. There has to be a force that makes the coupler's seal sit tight on top of the zerk. I don't think the side of the zerk has match to do with making the seal , as some claim. I saw a cutaway drawing once of a Lock n Lube coupler that got me thinking about how the seal is made. That big spring you can see on the device does very little to actually pull the coupler tight against the zerk. It's job is realy to push the sleeve back over the jaws and make it stay there. The jaws locking onto the zerk seems to ensure that the zerks seal surface is nice and close to the face of the sealing rubber. By the way, the sealing rubber is not an O-ring. It is bigger and longer than an O-ring and appears to have been engineered to use the pressure in the grease to apply clamping pressure to the zerk. That's where it starts to get really interesting. If the zerk is resisting taking grease and the pressure in the gun and hose and coupler all increase then more pressure is going to applied to the sealing surface. It's looks pretty cunning. The sealing media, unsure if it is rubber are some other similar material, is made in a small and large diameter. The small diameter goes on the zerk and the larger diameter is first to feel the grease coming into the coupling and acts like a piston. It looks like it is designed to push the rest of the seal forward against the zerk. A big question I can't answer yet, is how they get the seal in. Because it has to go in big end first. We need some people with lots of money to cut some of these couplers open so we can study them a bit closer. Thanks Regards Stephen.

Watch the macnaught video..it shows you how to use it properly…do your research before testing.

Watch your video close on the Lock N Lube on the top zert It doesn't look like it is recessing all the way back in the tube Might just be camera angle.

If that's a saker good luck getting it

If you would like to see a picture of the cut away I saw, I would be happy to share it with you some how. It was in a KZfaq video so I could send the link if you are interested. Bye

My lock& lube started leaking something fierce as well, and I've barely used it for a long period of time, it cant possibly need a rebuild yet, I dont get it!!

Ive tried many grease gun couplers also. I always go back to the Lock n Lube xl. I like the extended length and i only have 1 zerk that I struggle with the extra length. What kind of grease do you like to use?

Does grease pressure lock the macnaught on or does it suck?

You are not using the KY coupler properly. It may work the way you are using it, but the mechanism gets ‘cocked’, then push clicks onto the nipple. Nonetheless, I’ve been through two, and both failed first use. The concept was good… that’s about it.

Here it is kzfaq.info/get/bejne/abB6e7p5xr2agoE.html Go to 2.03 point on the video.

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