Vacuum pumps, while expensive, have a ton of uses, like vacuum sealing food or saving space with items in storage. Instead of buying one, though, you can convert an old bike tire pump into a ...

A cheap vacuum pump will get you part of the way there, but to really pull a hard vacuum, you need an oil diffusion pump that costs multiple tens of thousands of dollars.

Vacuum pumps are available with manual hand-operated triggers or with connectors designed to attach to an air compressor, which makes the job much simpler.

Step 4: Use the pump to create a vacuum inside the tube. Depending on the device, the pump may be manual or motorized. The vacuum brings blood into the penis.

A bigger, more powerful vacuum pump is joined in a custom enclosure by a PCB with a PIC18F13K22 microcontroller, a power supply, a solenoid to control the vacuum, and a relay to switch the pump.