Head pump ?

I've never used one, but I've always heard that the penis head is different from the shaft, in that it can't be permanently changed through any kind of PE. When I finish a pumping session the head is always bigger, but it's the first thing to return to normal size, and while I think I've gained a little permanent girth increase, I don't think the head has changed at all. Anyway, that's as much as I know. Hopefully someone more informed than me will chime in soon.
 
Well said Asher. There are a great number of nervous receptors, tissues, and fascia in the glans. The pressure from water or air pumping directly on this tissue means fast expansion, like a swollen lip. Blisters are common, as well as petecia. Even the best experts at pumping have difficulty pumping just the head.
 
I've pumped up my cockhead to a huge size,but it's always gone down instantly when taken out of the tube.
As said before, the head is different from the rest of the penis.