MRbrew Plastic Carbonation Cap, 2 PCS Ball Lock Keg Post 5/16'' Beer Line Nipple Barb Homebrew Kegging Soft Soda Drink PET Bottles Counter Pressure Bottle Filling Cap with Spare Sealing Gasket O-rings

The Plastic Carbonation Cap with Ball Lock Keg Post works perfectly for quick carbonation and pressure transfers. It fits tightly, seals well, and is compatible with standard PET bottles

Works great. Plastic not too soft and wears well. Screw on tight. Based on how well these worked I upgraded to a Soda Stream. Would buy again

They are pretty good but the inside part can sometimes get lose so be mindful to check everyone and while to screen the spring tight.

I purchased a number of these to streamline carbonation of beverages in 1L bottles. These seal very well without any force at all on a 60# charge. They are sized so that two different brands of charging fittings go on and off equally well. Get a Bunch of these. Charge your drinks and refrigerate until use with these caps still on the bottle. Take them out and top them off at the time of use. Switch then to a standard cap if you want.

Freshens up flat soda, or makes new soda. With these I can make soda far cheaper than soda-stream will allow.

I save the 1 quart soda bottles and refill with COLD (via frig) filtered water 3/4 full. Squeeze out the air, add one of these tops and tighten. Attach the ball cap fitting at 50 psi on the gauge and shake for 2 mins until you see very little bubbles coming out of the stem. I do 4 at a time. Then I unscrew the pressure cap, add a squirt of Stur or 1 tsp of Root Beer extract and vanilla and 2 Tbsp stevia sweetener... AND I use one of the other 4 bottles to top off each of the other 3! Put the old caps back on the bottles. Results in 3 full bottles. I do fresh squeezed lemon + lime too with 1/2 tsp of stevia. Easy way to make cheap soda's if you have the tank, gauge and hose around as beer/wine making equipment.

I ordered these not expecting them to be plasticky and flimsy. Not at all the case! These are made of a very hard, durable plastic and the package even contained plenty of extra O-rings! The valve inserts easily into my current ball-lock quick disconnect adapter, even better than the stainless steel one that I've been using up until now. The main reason I bought these was to use them as caps for my bottles. It occurred to me that I was losing quite a bit of CO2 by simply removing the carbonation cap and recapping the bottles with their normal bottle cap, before even using them...essentially the equivalent of buying a 2 liter in a store, bringing it home and opening it but not actually drinking it until a few days later. No one would ever do that, right? So now that I have these caps, I add my natural flavor packet first (unsweetened; True grapefruit or True lime) and carbonate the water with these caps, leaving them on until I'm ready to drink. The problem of releasing initial carbonation is solved with these! Very impressed with their quality, and the value of this pack of 4 is fantastic!

As described. They’ve held up well to daily use.