FERRODAY Stainless Steel Carbonation Cap Forced Carbonation PET Bottle Filling 5/16 Barb CO2 Coupling to Carbonate Soda Beer Stainless Steel PET Bottle Carbonation Cap + O-ring + Gasket(2 Pack)

When we got the carbonation lid for our corny keg, we were trying to figure out a way to provide carbonated water during the 2 days it would take to charge a fresh keg, and found these (same brand). The idea of being able to take a bog standard 2 liter bottle and charge carbonated water in it was, TBH, mind blowing, so I decided to give it a try, in the hopes it would give us a backstop while the keg recharged. The cap itself is cut on the sides allowing you to use a keg spanner to tighten it up, a really useful feature for us with physical disabilities that make grip an issue. It works so well! One thing that we did though was to get some liquid tubing, and a pair of micro porous stones (Ferroday again). We hooked the tube and stone up, in the hopes we could get the micro porous stone speed, and easier to store standing up while it charged. It works well in both cases. So for 3, 4 hours of charging, at 35psi, we get a 2 liter bottle of carbonated water. Any short of a time doesn't seem to work, but I don't know if this is a limitation of the carbonation cap or operator error, as I've seen YouTube videos that claim less than an hour to charge a bottle. I'd recommend this, both for charging a 2 liter bottle before going out, or as we're using it, to make sure we have standby fluids. If you're using this alone, rather than with the upgrades I mentioned, remember to lay the bottle on its side in the fridge for the tube to be inside the liquid.

I have had an original carbacap that I have been using for quite literally for 15ish years. They were made of nylon and work really really well, annoyingly I dropped the water bottle after it was carbonated with the cap still in place and the pressure bump from the drop (I carbonate to about 70#) was enough to make it start leaking co2. They havent been available for years and I saw the many good reviews for this and gave it a try, honestly I was pretty skeptical. I have tried a number of different caps over the years and have never found anything that works as well and that old one. They were bought out a number of years ago and the newer versions arent as good being made from a plastic resin, the original company name was liquid bread, if you ever spot one somewhere snap it up. I was delighted to find this has worked really well so far, Ive only carbonated a few times with it and Ill edit this if that changes but Im very happy with it so far. The only criticism I have is the outside shape, the round outside makes it slippery and not easy to get on and off, but that wont stop me from using it. Ill just be occasionally annoyed when I do, but Im easily annoyed anyway...lol

I bought this adapter to a soda keg valve only because I'd read that the "Carbonator" adapter, which I purchased and is plastic, got some bad reviews for durability. So far I am still using the plastic Carbonator, but I am so addicted to carbonated water that I thought it worth the 18 bucks to have this stainless carbonation cap as a reserve. One aspect that I'm curious and eager to try out is the nipple at the bottom of the cap. It receives a quarter inch hose that can be supended into the water while the pressure is applied. I think having the CO2 gas inserted directly into the water, might speed up the carbonation process because it will agitate the water. The blue Carbonator does not have this nipple so the gas is inserted into the bottle and remains at the top of the bottle for a long period of time; hence, the need to shake the bottle and diffuse the CO2, as many YouTubes instruct. I'm not sure if my theory is right here, so I will defer to anyone who knows more about the effect of the gas tube being suspended into the water. Revised: I threw out the plastic blue Carbonator cap and have been using this stainless steel one. It is much better. It is threaded with greater accuracy than the plastic one. The steel threads merge with the plastic Pet bottle threads very smoothly. The nipple at the base of the cap is useful: I attached a six inch plastic hose that allows the gas to be inserted directly into the water, the same as the design of the otherwise flawed Sodastream design (the flaw in Sodastream is the gasket seal between bottle and machine is faulty). This stainless steel cap seems pricey to me, but I'm sixty five years old and everything seems to expensively priced to me.

These are a little more expensive than the plastic carbonato caps. I have used the plastic ones and they are not as durable. I have had to replace the plastic ones more often than I would have liked. These are super durable, I have never had any issue with them. The gaskets that I have gotten with other carbonate caps have sometimes had some issues fitting sone bottles. The gasket would somehow slip and not form a good seal with certain bottles. However, these caps have been problem-free for me. Of all the caps I have used these have been the most reliable and durable.

This cap has worked very well for me. I do have to report there was a small learning curve. I use the cap mostly on 1 L Smartwater bottles with CO2 at about 40 psi. I initially tried screwing on the cap too tight and it is possible to screw it on so tight that the vinyl gasket inside folds in and jumps into the neck of the water bottle rather than sealing onto the top of the lip. The cap will then leak. Since doing this a couple of times initially I now screw the cap on to make contact and then just some more to get a good seal and it has been perfect. I have left it in the refrigerator on an opened partially consumed and recapped bottle of carbonated water and came back a week later from vacation and the bottle still had pressure in it on removing the cap and the water was still carbonated. I also just unscrewed and removed the small filling tube on the bottle side to make it easier to clean and it it is not needed. I rarely clean it unless carbonating something other than filtered water. I have not had any o-ring problems using it 3 months so far.

Overall I'm impressed with this. The ball lock coupler works well, the cap fits a standard 2L PET soda bottle and doesn't leak under pressure, and it seems well built. I am able to use it to carbonate water in a 2L soda bottle. BUT the barb included is NOT 5/16", it is smaller. A 5/16" ID hose slips right off of it. This is not a new complaint (check the Q&A for this item). I really wish they'd update the product description to be accurate. Now I have to buy a smaller hose. EDIT: the barb is 1/4" and holds on to a 1/4" ID silicone hose well.

This product really surprised me as to quality for the price....it's hefty stainless steel and precisely machined. Very glad I didn't buy a plastic one....but this was only a couple bucks more. I use it to carbonate homemade soda and just make seltzer water in 1l and 2l plastic bottles. The counterpressure bottling attachment (the barb underneath) easily unscrews if you are just making seltzer. If you are counterpressure bottling (ie bottling in a pure CO2 environment to prevent oxidation) your latest soda concoction (my favorite.....blueberry basil) leave the CP assembly in and attach a liquid hose to the CP dip tube barb into the bottle. And remember that forced carbonation is tricky if there are chunks in your brew. Strain and filter your soda pop first. You will also need a CO2 tank, regulator, gas line, and *ball-lock* (not pin lock) gas line fitting. ...basic draft homebrew beer equipment. I was going to buy a Sodastream, and did a facepalm that I already had the gear.........just missing this fitting for plastic bottles. Also, comes with extra ball-lock gaskets. Very satisfied with this purchase.

My local home brew store could not provide me with one of these that worked. It was plastic trash that would not work with the ball lock they set me up with. I thought maybe it was a defect and returned to see if I could get a refund or exchange, and they couldn’t get it to work either, and a new one also would not work. This one is well-built, looks good, fits on standard bottles, has no leakage, and costs less than the name brand, plastic junk.