Hand held carbonator.
581184
Works fine and as advertised.  The carbonated water is just right and keeps its fizzle for a day or so.
631214
I have two of these now, and plan on getting a third. Who needs big ol metal or glass growlers? These hold near the same amount once you put it on a 2L bottle.
While kegging, I rack off about 1.5L to a 2L bottle, then squeeze out the air, put the Carbonater on, and pressurize with CO2. Shake vigorously, and keep adding CO2 till it won't accept any more. I refrigerate the 2L, clean up after the kegging, then repressurize and shake the cooled beer. It carbonates it JUST FINE! Highly recommend these. Nothing like taking 'Redneck Growlers' to a beer competition or homebrewers meeting.
3311385
Wow! I bought this as my wife's Christmas present. She loves it. Beer flows out nicely once I had the keg and CO2 bottle installed. Set the CO2 at 8psi.
1772848
I love using this one in place of my plastic one.  I attached a piece of tubing on the end to extend into the bottle to help carbonate faster. I do recommend having a check valve along your gas line to prevent any damage if you are going to do that though.
1427707
The iSi Soda Siphon is an expertly crafted piece of equipment.  It is very sturdy and even seems elegant.  Do everything the reviewer A. Abdine listed except I would add that you should fill the bottle with water and then chill it for 2-4 hours before charging it with CO2 to get the maximum amount of carbonation.  Really shake it vigorously and make sure you chill it again for 4 hours before use.  The carbonated water it produces is pretty comparable to seltzers you can buy at a store.
4946358
There are well priced combination CO2 and smoke detectors.  They are battery operated.
2416176
Easy to use with SODAPLUS 76327 Soda Carbonating Starter kit. Doesn't take up a lot of room. Fairly inexpensive.
4083414
Working great in my chest freezer to beer fridge conversion (for maintaining homebrew and keg temperatures). I made one before with a more expensive controller, but this one seems to work just as well.
1215940
I have tried other carbonating caps and this one by far is the best. I keep a 30 pound CO2 tank at home and make my own seltzer water to have bubbly water over soda is a real game changer.  This device works perfect, I just squeeze out the air in my 2 liter bottles, place the cap on and tighten it then hook it up to the hose and ball lock and bam !! The bottle inflates and I start shaking like the old soda jerk in the 40's.  As you shake the bottle the CO2 absorbs into the water and in a minute or so you have pure seltzer water.  You can add a small flavored syrup just to get an essence and you're set.  On some occasions the bottle won't inflate and you have to blow out the air in the line after turning your tank off, just re-seal the cap on the bottle and turn your pressure on and you'll get the gas going again. I found this device demonstrated on youtube and then saw that Amazon had the best deal. Make sure your water is real cold when you carbonate it as well.
382296
I like the portable refrigerator idea of propane fuel use for hurricane usage and power outages. I plan on it's use for important refrigerated medication and food. I felt it was a good price.
2953804
In just a couple of hours, the carbonation is very depleted. Returning and ordering OEM Soda Stream bottles.
2102930
Works for a bottle converter, the carbonation still dissipates though
2882254
They really work! When my wife or I open a can of beer or sparkling water, we sometimes need to put it aside for a while. These caps hold the carbonation in very well.
4137797
Saw it used at a friends house and had to have it. Bought enough spare canisters to open 600 bottles. Hope I live that long.
3087889
I am using this in a DIY home Carbonation set up. It seems to make a difference in the speed at which the co2 is absorbed. For the cost, it can't hurt.
1626348
It is nice to make beverage keep cool longer. This is work well with whisky or with small volume beverage that don't want to it's diluted by water from ice.
4561049
suitable for one person. little bit small if 2 or 3 people want to drink. the pitcher is a little bit dirty but after cleaning it is good!