Reddit reviews Dixon Valve & Coupling TTB50 PTFE Industrial Sealant Tape, -212 to 500 Degree Fahrenheit Temperature Range, 3.5mil Thick, 520" Length, 1/2" Width, White

Since it's a cheap piece you probably just want a cheap fix...

Maybe wrap the downstem with some teflon tape to seal it up and keep it from wobbling.

Are you using an NPT or triclamp style tube? If you're using NPT (national pipe thread, american pipes in inches basically) you can get a brass NPT ball valve, a reducer to put into the valve for a smaller thread size, and another brass piece, this time a 1/4" flared end for gas. You'll need teflon pipe threading tape to seal everything up and a vice grip or a couple of pipe wrenches to put the thing together. You can get all of this on amazon.

If you have a device like in picture with triclamp ends you'd already know where to get all of this crap but www.glaciertanks.com and www.brewershardware.com sell all the triclamp pieces you will ever need. Glacier Tanks is in oregon and supports the CLS extractor community directly by selling pre-fabbed terpinator style lids and collection pots, Brewers Hardware has a bunch of stuff they don't carry though as well. I've used both and they are awesome. Brewers Hardware also has lower prices on a lot of stuff like the spools you'll be using as extraction tubes, and they sell the national pipe thread to triclamp ends that I'm gonna need to modify my own old open blast tubes (my 1-2 and 3-5oz tubes depending on material and how tight it packs) into CLS parts. I have a calculator setup i've figured out though for how big of a tube can fit how much material for CLS use though. a 3"x18" spool fits about a half pound (bhogart sells a 3"x36" as their 1LB unit and it fits roughly that), so I figured out its volume from there and I can figure out how big of a tube will fit say 1oz, 2 ounces, and so on. you don't need perfectly filled tubes with CLS extractors either, you can fluff the top with coffee filters so the butane disperses evenly on the top, and typically in a shower style unit like the Bhogart, the top few inches don't get properly extracted anyways if you fill it all the way to the brim. I try to leave 2-3 inches at the top of the 36" column bare so it can just shower down and it seems to work really well, but with a narrower tube size you will probably be okay.

IF you got this far, you also are going to want a can cracker. You can use it on the top of the pipe in lieu of the brass hose hookup by screwing it directly to the top, but you need to make sure you get the right fittings for it. It looks like the crackers they sell all have the 1/4" flare end facing the wrong angle, so you'll probably need the hose after all. here's the cracker and a link to the right type of hose, as well as a link to one of the fitting types (though maybe not in the right NPT thread you need).

cracker: http://smile.amazon.com/Robinair-10102-Side-R134A-Respective/dp/B0009XT7NY/ref=sr_1_2?ie=UTF8&qid=1421275663&sr=8-2&keywords=refrigerant+can+

PTFE lined chemical hose buying list. you want 1/4": http://smile.amazon.com/Unisource-Chemical-Assembly-Connection-Pressure/dp/B007USNQNI/ref=sr_1_6?ie=UTF8&qid=1421275772&sr=8-6&keywords=ptfe+lined+hose

the style of brass end you need: http://smile.amazon.com/dp/B000WTXICQ/ref=biss_dp_t_asn

brass coupler to put the end into:
http://smile.amazon.com/dp/B006PKMJCQ/ref=biss_dp_t_asn

something to put the brass coupler into to make it fit your valve: http://smile.amazon.com/dp/B00835RTY4/ref=biss_dp_t_asn
2" brass valve: http://smile.amazon.com/dp/B0081LIGIS/ref=biss_dp_t_asn

ptfe tape: http://smile.amazon.com/Dixon-Valve-Coupling-TTB50-Temperature/dp/B00IIJB7F2/ref=sr_1_3?s=industrial&ie=UTF8&qid=1421277137&sr=1-3&keywords=ptfe+tape


after reading around, you said your pipe was 2" so i modified the list with everything you'd need to modify a 2" pipe.

Thread tape. Piping tape. Whatever you want to call it. Just pick some up at Walmart or something. They're cheap. Something like this:

Dixon Valve & Coupling TTB50 PTFE Industrial Sealant Tape, -212 to 500 Degree Fahrenheit Temperature Range, 3.5mil Thick, 520" Length, 1/2" Width, White https://www.amazon.com/dp/B00IIJB7F2/ref=cm_sw_r_awd_ytvyub059TS27