I use a vamo and protank and they work well together. you just need to be careful not to over-tighten the protank on it. just thread it on till it's slightly snug, otherwise you could end up pushing the center pin on the vamo in, causing some damage. and yes, all you need to replace on the protank is the head... I find they last a really long time. I ordered a bunch of extra heads and just soak them for a while, while others are in use and dry them off and dry burn them a bit and cycle them that way.