In our Build Your Own Hydroponics Bucket Drip System article we discussed making sure any pump you use has a removable filter, If not you will want to create one to keep debris out of it.
The Through holes/Bulkhead fittings come in all sizes and shapes. They are used in all sorts of industry’s, but most home improvement stores carry them somewhere in the store, and very likely have them in more than one place. The Through holes/Bulkhead fittings come in all sizes and shapes. The ones that I used for this system I found at Home Depot for $1.97, right next to the electrical conduit. We've listed some pumps below to get you started.