Soda Stream Refill Bottle Co2 Cylinder Cartridges, CGA320 Adapter Cartridge Refills Connector Kit to TR21.4, Thread Set Replacement Accessories for Sodastream Machine Tank

Works with both the old style pin ("A" from the photo) and the newer harder to fill flat pins ("B" from the photo).What I use:-I bought a 20# CO2 Tank (This one: https://www.amazon.com/gp/product/B00ICOKQMI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)-This tank has no siphon tube so you must invert it to fill a Sodastream CO2 bottle. I use this 20# tank for other purposes hence I didn't want the siphon tube. Your preferences may vary.-I had my tank filled with CO2 at my local "Airgas" store, but there are other vendors. You can swap your tank for one of theirs, but I preferred to keep my shinny tank, paid a couple of dollars more, and waited the week it took for them to fill my tank and have it ready for pickup.How I fill the Sodastream CO2 bottles:-I fill them two times to get as much as I can into them.-1) Attach the refill adaptor to the 20# tank. Make sure to use the gaskets provided and that the bleeder pin valve on the side of the adaptor is screwed in place with it's gasket. (When this valve is opened under pressure sometimes the gasket gets pushed out lopsided. Open this valve most of the way and then tight it to ensure the gasket goes back into place properly before each use.)-2) Attach the Sodastream CO2 bottle.-3) Turn the 20# tank and assembly upside down if you do not have a Siphon tube inside your 20# tank like me.-4) Open the valve on the 20# tank slowly. If you have a Sodastream CO2 bottle with the flat pin ("B" from the picture) you need to open the valve very very very slowly or it locks you out to refill and you have to release the pressure and start again. You will her some creaking like noises when the CO2 start to flow.-5) Let the CO2 flow until you hear no further noise before moving to the next step. I usually let it sit for 10 min.-6) Close the 20# tank's valve.-7) Open up the bleeder valve on the refill adaptor to release the pressure.-8) Remove the Sodastream CO2 bottle.*** Note: At this point the bottle is partially refilled and usable, but follow the next step if you want to maximize filling it.-9) Place the Sodastream CO2 bottle in your freezer for an hour. This helps the CO2 compress (remember your middle school science class!).-10) Repeat steps 1 through 8. I usually notice a significant increase to the weight of the bottle once this second filling is complete.***Notes-You could start off with freezing the empty bottle and just fill it once. Due to thermodynamics and mass you wouldn't get quite as much CO2 into the bottle this way. I just prefer to get as much into it when I'm going through the filling process.-Each time you fill from your 20# tank the pressure will drop. Due to this as time goes on you will get less and less CO2 into your Sodastream CO2 bottle with each refill. You'll still get many substantial refills out of a single 20# tank and the economics of this highly works in my favor.-At some point as the 20# tank eventually gets towards empty it will just make sense to get it refilled even though there is some significant CO2 in the tank, but there just isn't enough pressure left to substantially fill a Sodastream CO2 bottle.-My 20# tank, this adaptor, and first fill of the tank cost <$200. Given the current cost of a new Sodastream CO2 bottle is ~$30 it does not take long to recoup your costs using your first fill up of the 20# tank. Even if you use one of the exchange programs that works out to ~$15 a bottle you'll still have paid for your setup and then some with that same first fill of a 20# tank.***If you are having problems getting one of the Sodastream CO2 bottles with the flat pin ("B") to fill it's most likely that you are opening the 20# tank's valve too fast. You have to open it very slowly. I basically just crack it open and never open it more than that initial crack that starts the CO2 flowing. To crack it open I just put pressure to turn the valve counter clockwise without actually turning the valve. I'll continue to apply pressure to turn the valve for 10-20 seconds until I get it to turn just a tiny tiny bit opening the value just a crack to let CO2 flow and that is as much as I open it. The 20# tank valve likely only turns a 1/64 of a turn.

This seems to be well made, and worked fine, following the instructions posted with AMZN product page. Much simpler, less to go wrong, than most of the kits for sale. Would be nice to have a plug/cap to keep the connection clean between uses.If you're new to CO2, as I am, you may not know that the temperature in your car on a sunny day may be hot enough to cause the tank to overheat and blow out the safety disk, discharging how ever many pounds of CO2 are in your canister into your car. For my pickup, empting a 5 lb. canister raised the CO2 concentration to nearly 50 percent in seconds--enough to have killed me had I not realized what was happening before I blacked out. I had left the full tank in the car while picking up a few groceries, and had just pulled into traffic when it blew, happily before I was on the freeway, which might have injured others. I was able to quickly stop the vehicle and, with some real difficulty--high CO2 concentrations stop the brain from working--managed to open the door as I collapsed. Able to drive again after maybe ten minutes, headache and a bit woozy for an hour or so.

I got a 20 lb co2 tank at the local brewery store to refill my soda stream bottles.A couple notes since there are no instrucitons.empty the soda stream co2 bottles and then put them in the freezer for at least 20 minutes.put the two large black rubber orings on each side o the adapterscrew onto co2screw refill bottle on adapter.slowly open co2 bottle so you don't trigger the shut off valve on refill.you will hear it fill up slowly takes about 1.5-2 minutes.If you open the co2 too fast and it shuts off you just turn the co2 off and fit the relief valve on the adapter to release gas.Then open co2 just a bit to let it fill slowly.enjoy

This little gadget couldn't be easier for refilling SodaStream CO2 canisters. We use a 5lb CO2 tank for homebrewing beer, and this adapter connects to the 5lb tank on one end, and the SodaStream tank on the other. Open the 5lb tank valve (just a little bit!) and the SodaStream tank fills in about 2 minutes. It's so great! Way easier and less expensive than exchanging every time.Tips:Chill your empty SodaStream canister in the freezer for an hour or so first. The colder your canister, the more full of CO2 it will get.Only open the valve of your refilling CO2 tank a tiny bit, the smallest amount that you can open it. SodaStream canisters have a special valve that will close if the pressure on them is too high.Use your ears to tell when the SodaStream canister is refilled. You'll hear noise while gas is going into the canister but it will stop once the pressure has equalized. This means your SodaStream canister is full!