my case explodes when i light the end of my tube. i have a vacum checkvalve and i run my tube into a cup of water and lite the bubbles. it was just poping at first then boom it blowed the lide off. this is the second time this is happend. no real damage but it scared the .. out of me so im not going any farther untill i can find out what is going on. ill post some pics next week so you can see what i have for a cell and see if im doing something wrong..