Pneumatic Air Tank for Legos




About: Hi, I'm Ben. I like mechanical engineering, and using free stuff/"junk".

This is an Instructable for an air tank that can be used with lego pneumatic elements for powering robots without continuous pumping. This goes along with my pneumatic snake, and my bike pump adapter instructables.

Step 1: Materials

You will only need a few things.
  • A plastic bottle that can hold pressure. I used a carbonated water bottle. Anything should work as long as the top seals.
  • A tube that your pneumatic hoses will fit over. I used some hard plastic ones that come in some lego sets.
  • Glue-preferably something thick. I used hot glue.
  • Something to make holes in the bottle cap about the size of the tubing. I used a drill but any sharp pointy object will work.

Step 2: Make It

This is a very simple process.
1. Make two holes in the center of the cap. If they are off to the side the cap wont seal
2. Cut two lengths of tubing about an inch long and put them in the holes
3. Secure them with glue.

Congratulations, you just built your first lego air tank.

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    10 Discussions


    7 years ago on Introduction

    Lego also sells these if you don't want to make one.

    the gizmoman

    8 years ago on Introduction

    If you are willing to spend a little, "robart retracts" has alluminum air tanks and airline (for pneumatic retractible landing gear for rc airplanes ) the tanks are about 10$ for the small and 15-16$ for the large tank and about 7$ for 2 10 ft pneumatic tubing

    Capt. Fat

    10 years ago on Introduction

    Hi I liked your instructables that involved pneumatics. I am wondering if you could make them into knex versions with hospital syringes and tubing? If you are I will give all your instructables five star ratings.

    1 reply
    benthekahnCapt. Fat

    Reply 10 years ago on Introduction

    I don't have any syringes, but I'm sure it wouldn't be too difficult to adapt the instructables for knex.


    10 years ago on Introduction

    What are the two smaller tanks made from? I understand that you glued Legos on the bottom but what are the actual tanks made out of?

    2 replies