Beer Bottle Cap/Seal/Lid?

[htm6934]

I'm looking for a seal/cap for a standard beer bottle mouth(not twist off type) that will prevent any C02 from escaping. I want something that's sort of a slip on type cap rather than an actual crown cap. I am familiar with the plunger style where you pull the lever down and the sides of the stopper expand but I am not interested in that type as I plan to put a c02 and beer line down through the lid. Again, has to create a c02 seal.

Any help would be appreciated as I have googled to the end of the internet already. THanks!

 

[BargainFittings]

Don't think I have seen anything like this. I've looked as well.

What are you trying to achieve with the cap?

 

[Gravity]

You can probably make your own out of a rubber stopper, they come in different sizes. You're probably looking for a 1 or 2 size stopper

 

[ong]

These work reasonably well; at least there is a noticeable hiss when you slide them off. https://www.amazon.com/dp/B0010AWH2I/?tag=skimlinks_replacement-20

 

[flars]

Are you thinking of a carbonation cap like this one. There are others on the market also.
https://www.amazon.com/dp/B01039C0Z0/?tag=skimlinks_replacement-20

edit: A press on plastic cap probably would be pushed off by CO2 pressure unless you don't need to hold full carbonation. They make caps like this for opened soda bottles.