I'm looking on amazon, and see a Standard Saddle Valve, a Self Piercing Saddle Valve, and a few different sizes listed. Does anyone who's purchased one of these things to punch holes in cartos for tanks and who's getting a good result have the name/info of product they purchased? I do my buying online, for most part, so can't just run out to store if I get the wrong thing. Thanks for your help! Oh, and I've heard there's youtube videos that show the hole punching, so hoping I'm good there. BTW, looking to punch both black and stainless Boge and Resurrectors, if that matters. Thanks!