I've just recieved a new ProTank2 this afternoon and was looking it over. There are two o-rings that were packed just under the eGo beauty ring that I can't figgure out what they are for. The instructions don't tell you. The only thing I can figgure is that they are a little larger then the ones on the origional drip tip to fit slightly smaller drip tips on to the PT2. Am I correct in this assumption?