This is designed so that when the lid is put on, the drip line is gently pinched between the lid and the pad, so it stays secure.

5) Fan

Trace the inside of your 4-inch Coupling* onto the bucket lid and cut this out with a sharp exacto knife. The hole should be exactly sized to fit the round part of your fan:

*The 4-inch ABS Coupling is actually 5 inches across. Dammit! It’s called a “4-inch coupling” because it’s meant to couple 4-inch pipes together, but that means the coupling itself is actually larger.

Make sure to pick out the correct product at the store. This coupler will fit perfectly into a 5 inch flexible duct and also matches the size of the CPU fan.

This piece can be hard to find. Check the plumbing section of your hardware store or use our parts page.