Instructables
Picture of Garden Hose Pipe Pump
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!"
 
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Step 1: Materials and Tools

Picture of 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.

Tools-
Hacksaw
Drill & Large Drill Bit
Dry Erase Marker
Duck Tape

Step 2: Building the Pressure Chamber

Picture of 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!

Picture of 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!
Kiteman3 years ago
So, you're underwater, and you're relying on a guy with a big bike-pump...
EngineerJakit (author)  Kiteman3 years ago
I thought of saying something witty, but nothing is coming to mind. Except increasing air pressure.
rickharris3 years ago
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.
EngineerJakit (author)  rickharris3 years ago
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.
iPodGuy3 years ago
Couldn't I just use an air compressor with a long hose?
.  Probably not. A high pressure pump will produce CO, NOx and other nasties. A pump that uses oil will introduce oil into the air. It really needs to be a low-pressure, oil-less  pump (unless you want to filter and scrub the air before breathing).
EngineerJakit (author)  NachoMahma3 years ago
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.