To go along with the 5 Gal. Diving Helmet intstrucatble I made, I built a pvc pipe pump to supply air to the helmet. All you need to connect the pump and helmet together is a garden hose. You can build the pump to any size you want, but this was all made on a cost of $30-35.

All the parts I bought were from Ace Hardware and lets just say the more complex pvc parts cost more than $2, which was a little alarming for me at first, but I was like "screw it, i'll pay!"

Step 1: Materials and Tools

When I stopped by Ace to get the parts, I recieved a lot of help from one of the workers. The parts that make up the nozzle were a brass Pipe-to-Hose fitting, two outer-threaded connectors, and a part whose name i cannot remember but it was essential to let air be sucked into the chamber and pumped into the helmet. Anyone can refresh my memory about this part.

Drill & Large Drill Bit
Dry Erase Marker
Duck Tape

Step 2: Building the Pressure Chamber

Since i can't remember the names of the parts, you'll have to refer to this picture on where to put stuff together.

Step 3: Assembling the Plunger

For the plunger, I used the thinner pipe and two threaded attachements for the shaft. The plate was made of two cardboard coins and a piece of fleece. I cut holes in the centers on the three circles and insert the threaded plug into all of them. Then I put the plug into the attachment and duck tape the part and pipe together so they would't come apart when I slid the plunger through the cap.

Before I added the handle made of excess PVC and duck tape, I drilled a hole slightly larger than the diameter of the plunger pipe. When it fit well, i put the cap on the way it should be facing and taped on the handle.

Step 4: Seal and Finished!

After I attached the cap to the chamber, I added more tape to various areas to seal it up and contain more pressure. Added some tightening to the nozzle parts, tested out the force of compression and I was finished! So now I am ready to test out my diving helmet!
<p>A kindergardener made this!</p>
<p>Kiteman is right</p>
So, you're underwater, and you're relying on a guy with a big bike-pump...
I thought of saying something witty, but nothing is coming to mind. Except increasing air pressure.
At the risk of seeming a kill joy this type of diving helmet is fraught with DANGER - you need weights to get under water and IF?WHEN things go wrong your weighted down!!! NOT GOOD.
True, and i conducted my test with the weights on. This pump worked as well as expected and kept my helmet with some level of air, and floatation. Had I found a way to seal the underside so water would not get in the helmet, then I would have been truly safe to test it out. Luckily im a good swimmer.
Couldn't I just use an air compressor with a long hose?
.&nbsp; Probably not. A high pressure pump will produce CO, NO<sub>x</sub> and other nasties. A pump that uses oil will introduce oil into the air. It really needs to be a low-pressure, oil-less&nbsp; pump (unless you want to filter and scrub the air before breathing).<br>
This is true. Using a bike pump or something more hand-powered would be a good thing to use so that you don't choke on the air instead of the water (in the case the helmet would fail and leak.

About This Instructable


14 favorites


Bio: A YouTuber and maker hobbyist trying to get a better hold of life and stuff!
More by EngineerJakit: How to Play Guards vs Thief "Wall Netting" - A Decorative Display for your Everyday Stuff How to Build a Bed Fort using Paper and Office Supplies
Add instructable to: