debb in post above has a link to show what it is. Some of them don't have a nut on the screw and I like them better, they just screw into the bottom piece with out needing a nut, so its a little easyier to screw together because you can turn the bottom of the screw with your fingers to snug it up on the carto. It works great and just a little dimpling but looks good. The last one I am using now I put 2 holes in it near the bottom of the plunger, and used the saddle valve screwed together hand tight, after positioning the carto where I want the to hole to be. Then I turn the handle of the saddle valve all the way until it stops. You will hear it pop when it first pierces the carto then keep turning until it stops. Its a little messy but you might want to start with just 1 hole and see if it works ok, if not drain the tank and take the carto out and punch another hole. These tanks do make your cartos last alot longer. Hope this helps.Hey wyojoe - been searching the thread but still not sure what a SADDLE VALVE is or where you get one!! - when you use this, does it put a big dimple in the carto - this always happened when I used a finishing nail and hammer so I went to a hacksaw - BTW, just had a 510 dual coil start leaking - others have speculated that the filler is TOO absorbent and tends to get oversaturated - so....removed the top end cap, poured the juice into a bottle and vaped the carto for anothter couple hours just fine - (will try a smaller slot on the next one) actually, it's still vaping great - I'm so into tanks though that when it dries out, will prob toss - just can't bring myself to drip more juice into it - any kind of dripping is just so yesterday - Thanks
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