That tool is just right, if need to WELD such plastic, but need to have just right plastic to add also, so then U must know exact, that material is that expansion tank... If tank is different material, then it dont function, like should.

My tank developed a pinhole and now sprays coolant when the motor gets above 200 degrees, so this has become a priority. Here is what I have found so far:
Plastic welding: no local sources found, my friend and I have played with a hot air welder and would not attempt mucking with this tank!
Plastic adhesive: I contacted Master Bond, their XP17 product made for polyethlene has a burst strength of only 10 pounds and costs $450 per quart. They recommended 3M DP-8010 adhesive. Available from the 3M store for about $20. http://www.3mestore.com/62278304308.html
I have bought some of this and will let you know how it works.
Replacement part: I have a picture of the Aprilia Pegaso 650 reservoir. It has two fittings, one in front and one in the rear. The ideal replacement for the Paso would have two fittings off the back and eliminate the Y hose that is becoming hard to get. I would love to hear what others have fitted, even if it is Japanese :laugh:

I resolved my Coolant tank problems this weekend (and future Y-hose availability). I will submit an article on this shortly, but the bottom line is coolant tanks should never have to hold pressure! Install a filler neck from a 95-98 Honda CBR 600F3 or CBR 600SE above your radiator and repair your coolant tank with Goop. This bonds well to the tank and will hold up provided it is not under pressure!
Art