Okay, for those of you who want to use tubing and a bong to filter the vapor, and want to connect via a tube instead of holding the MZ upside down on the bong itself, I think I have it sorted out now.
I had ordered some blue tubing from McMaster.com and when I got it, it was very stiff and creased when bent. Then I realized that I had ordered FIRM instead of SOFT.
So I called them and explained that I was dumb and ordered 4 ft of firm instead of 4 ft of soft and asked if the softer version would not crease. She said it was very soft so shouldn't crease. I gather she means that it could crease but probably would not under normal circumstances. So I'll have to wait and see. The soft silicon I have used before never creased, so I assume this will be the same now that I am getting the soft instead of the firm.
So this is what I ordered:
To fit over my MZ stem, I ordered #5236k45 . Ordering from their catalog page can be a little tricky if you're not careful (i.e; maybe order before you get vaked
), or call them on the phone and order and just make sure you are getting SOFT not firm, 1/2" Inner Diameter and 1/16" thick.
I will report back here if this does not work but I'm almost certain this will be the right one based on what someone in another thread told me.
I wanted to say that McMaster is a very good company, with good customer service. I got my order before in about 3 days and they only charged me $4.50 shipping (they charge based on actual shipping cost, not some arbitrary cost).
Also, when I told the woman on the phone that I simply ordered the wrong item - it was clearly my own fault - she said she'd replace it with the right product anyway. I also ordered 10 feet of 1/4" tubing because I think I might actually like it better when I connect to my launch box elbow stem coming out of the MZ stem and then to a glass adaptor I have on the other end that fits 1/4" tubing. So as to which is better for me, I will find out.
The 1/4" ID tubing is a min. order of 10 feet for 91 cents a foot I think, and the 1/2" inner diameter that fits over the MZ stems is $1.35/foot and you can buy as little as 1 foot.
http://www.mcmaster.com/#5236k45/=5gkodv