Stef64 and burns_erin, I had a similar problem last tuesday. One my V. Stones seems to leak on occasions rather profusely. After a few days of analyzing it that I figured it to be leaking from the polymer seal-insulator in the center post. This is what's causing the slurpy noise when I draw, exactly like a straw sounds on a slurpy drink. I did exactly what burn suggested. I applied enough silicone rubber (RTV) on a new unused one to cover the whole sealing area from the inside and let it cure for 24 hrs. I forgot about it and then my son casually said that his is using a lot of liquid and leaking also but he did not elaborate, then I remembered the one I sealed with RTV seven days ago. I am going to try it tomorrow morning and see what happens. I believe the center pin is too far extended out that when it is screwed on snugly into the PV (Provari) and EGO the pin is being shoved beyond the limit the seal could handle thus deforming the seal and causing it to leak. The manufacturer of this unit overlooked this problem rather carelessly, in my opinion. I do not know if you guys remember the first one (type I)? It did not have any "O" rings at all when Igotvape previewed it on the video. Note: I screwed it tightly on an ego batt and then applied the RTV so it will not have any stress on the RTV during the actual use.