I was having trouble getting the technique down for punching tank cartos and came across this great little tool on another thread(thanks to ED-209).At Home Depot it's $10-- "Poly Tube To Pipe Saddle Valve With Insert" http://www.homedepot.ca/product/poly-tube-to-pipe-saddle-valve-with-insert/924648.
I picked one up a couple of hours ago and have punched 3 Boge cartos so far and they are all working very well . Below is a link to a youtube video--I'ts really easy to use--after you hear the "pop" when the carto is pierced I've been going another rotation or two and it's been working for me--knock on wood!
$7.00 Carto punch from local hardware store - YouTube

I picked one up a couple of hours ago and have punched 3 Boge cartos so far and they are all working very well . Below is a link to a youtube video--I'ts really easy to use--after you hear the "pop" when the carto is pierced I've been going another rotation or two and it's been working for me--knock on wood!
$7.00 Carto punch from local hardware store - YouTube
