2 Liter Bottle Picnic Tap




Posted in LivingKitchen

Introduction: 2 Liter Bottle Picnic Tap

Have you ever looked at your fizzy beverage of choice and thought to yourself "Here I am pouring my drink into my cup like an animal.  There has to be a better way!"  Lucky for you there is!

Step 1: 2 Liter Picnic Tap - Materials

Materials needed:

2 1/4 inch ID barb tubing splicer
#2 rubber stoppper
2 liter bottle cap
2 screws
About 18 inches of 1/4 inch ID stiff tubing
Several feet of 1/4 inch ID clear tubing
23/64, 3/32, 9/32 drill bits

All of the above can be gotten at a Lowes or similar hardware store.  Home Depot does not carry the rubber stopper.

Step 2: 2 Liter Bottle Picnic Tap - Drilling Cap Holes

Your bottle cap will need 4 holes:
23/64 x 1
9/32 x 1
3/32 x 2

Check the picture for the configuration

Step 3: 2 Liter Bottle Picnic Tap - Drilling Stopper Holes

Your stopper will need 2 holes:
23/64 x 1
9/32 x 1

Make sure these holes line up with the ones in your cap.  Check the picture for the configuration.

Step 4: 2 Liter Bottle Picnic Tap - Assemble the Cap

Align the holes in the cap and the stopper.  Secure the cap to the stopper using the screws.  Insert the stiff tubing into the 23/64 hole and push until it reaches the top of the cap.  Insert a barb splicer into the top of the stiff tubing.  Insert another splicer into the 9/32 hole.

Step 5: 2 Liter Bottle Picnic Tap - Final

How do I use this crazy contraption, you say?  Simple!  Air pressure on the input side forces out liquid from the output side.  Ideally you can get a 1/4 inch picnic tap from Amazon to control the flow or you can control it depending on what you pump in.  If you have a carbonated drink you can block the input and the CO2 coming out of solution will provide the pressure. 



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    Soda water in contact with Copper or alloys containing copper (such as Brass) will react producing toxic compounds. If those compounds are ingested, you could become violently ill and/or die. Please take the appropriate precautions, such as using stainless steel fittings and installing a secondary flow-back preventer.

    The compounds produced when carbonic acid and copper react are toxic, and will induce vomiting, nausea, and a whole host of unpleasantness you don't even want to know about. Seek medical attention immediately if you ingested any such thing. Remember that when CO2 enters water, it becomes carbonic acid. Use stainless steel fittings to be 100% sure. Also remember that brass is an alloy of copper and zinc, and reaction will still take place.

    Brass is an alloy of copper and zinc. Bronze is an alloy of mostly copper and tin. Bronze may also contain aluminum, arsenic, manganese, phosphorus or silicon. Lead is not typically found in either alloy. I would be more worried about copper leaching from copper pipes because of softened water than I would be from a stable alloy like brass. As far as the acid in soda, how many high school brass musicians down soda before they perform at half time.

    1 reply

    Having been a trumped player, I can tell you that ALL brass instruments have silver-plated mouthpieces. It was common rumor that you didn't want the brass of the instrument to come in contact with your mouth.

    Hey guys, author of this piece here... Wow, I never expected to see this blow up this much. I'm here to address a few concerns raised.

    Regarding the metal leaching, yes I am aware of this. I ran into this initially when building a drink cooler with copper coils. If I had my choice I would use nylon fittings and indeed I do in several other places on the apparatus but I could not find them in the local hardware store. The primary focus of the materials list was to be able to source these parts locally. I didn't want for people to have to order anything and wait. The contact between the fluid and the fitting is momentary at best. This was not designed for long-term storage at all. I do not keep fluid in the tubing any longer than a few minutes before either dispensing it or draining it back into the bottle.

    Regarding the pressure comments: The first version of this did use the pressure built up by the soda itself but that ran out rather quickly. This version uses a pressurized CO2 tank reduced to about 10 psi on the low pressure side. I did not show this because I was trying to limit the scope in this tutorial.

    This version is rather out of date since I have been working on a more reliable cap. Thanks for all the comments and your support!

    About lead in brass, just because the main alloying components of brass are copper and zinc, does not mean that there are not other constituents, including lead. Lead is often added to soften the metal and make it more machinable. This is aside from the fact that the more a specification restricts the additional constituents, the more expensive it is going to be, so there is usually going to be some amount of something else in there. Here's the quickest reference:


    Whether or not the brass fittings here have a high (4-5%) amount of lead or not is a different story.


    beautiful! maybe cut down the materials and make it more functional?

    Clever and nice. I concur with dalesql...make sure to use stainless steel or plastic fittings, though, because the carbonic acid will attack the copper in brass, something you don't want to be drinking. In a past job one of my primary tasks was designing backflow preventers for carbonation systems, all for the sake of making sure carbonated water did not get back to copper and brass plumbing upstream in the system.

    Just as a heads up the co2 coming out of solution will not provide the pressure necessary to use this in any decent amount of time. I've tried before with a tap at the bottom where the co2 was to replace lost volume. In reality i had to squeeze the heck out of the bottle to even get anything past the first pour out and that was with gravity on my side, not working against like in this one. Go with the pressure inlet all times and you should be fine.

    This is a really clever idea! Makes a great solution for keeping homebrew fresh on the go also. A word of caution that you may even consider mentioning. Any carbonated beverage is going to leach lead out of the brass fittings. You absolutely must use stainless steel or plastic with carbonated water aka carbonic acid.

    7 replies

    Sorry stevfuri, there is no lead in brass. Brass is a single metal on it's own, it is not an alloy like steel. Many domestic plumbing fittings are made of brass and they are fine for decades and decades :) So, no need to worry about lead poisoning thankfully :) Well done for thinking about health and safety though :)

    Ummm, pretty sure brass has been a copper/zinc alloy for hundreds of years. . .

    Nope, you're thinking of bronze. Please, feel free to check it up :) I know this information because I used to be a plumber so I had to know my metals.

    Brass is copper + zinc

    Bronze is copper + tin

    You're right, I was wrong, about brass not being an alloy. I always believed it was a single metal. Fair enough, I have learned something new today and I thank you for this :) However, it's still a safe metal to use for drinking products :)

    No prob, bro. You are very magnanimous. We learn new things everyday, and that's the spirit of learning! However, i still beg to differ with your opinion on brass and acidic substances. Brass (depending on the ratio of copper:zinc, and the presence of other metals) does corrode, albeit very slowly, maybe even at a negligible rate. But it does.

    Cheers bud :) I just don't see the point in digging my heels in and trying to say "no, I'm right" when I clearly am not. I would rather admit that I am wrong and learn something than be plain silly :)

    I wonder if you are on to something with the brass thing and make up ratios? It would be interesting to find out if brass fittings specifically made for domestic plumbing had a less corrosive mix than for example door furniture brass? Or maybe it is just that the rate of corrosion (and thus, leaching of other metals out of the brass mix) is negligible when it comes to ingestion by humans?

    Danger! carbonated water is a weak acid, and will leach the metals out of the brass fittings into the beverage. Copper is not good for you. Substitute stainless steel or plastic for the hose barbs. If you are never going to use it with acidic beverages, then you are fine.

    Just checked. . . again and brass is still an alloy of copper and zinc. Bronze is a copper and tin (mostly) alloy.

    It's a good idea to use diet mountain dew as a tester as there is no real loss if you waste any.

    " Brass is a single metal on it's own, it is not an alloy "

    Brass is an alloy of copper and zinc