The vacuum supply will have a couple tanks made of 4" schedule 40 PVC. Again, this is all from Joe Woodworker's EVS plans. Here I'm using the table of my sander as a flat surface so that I can locate the center of the PVC caps for drilling for fittings.

Speaking of drilling....

It's starting to get hot here. Today was 100 degrees outside. When it gets hot like that, the garage doesn't cool down overnight. So, I decided to rig up a fan to kick on in the coolest couple hours of the early morning to help the garage cool down. We'll see if it works out.

I didn't have a 1/4 NPT tap, so I borrowed one from my brother. Unfortunately, it had a 9/16 shank which was too big to fit in the drill press chuck. so, in order to ensure I tap the holes straight, I decided to use this piece of oak as a guide. I drilled a 9/16 hole in the oak to match the tap shank.

...and kind of propped everything up on my sander table. This contraption did a reasonable job of helping me tap the PVC caps straight.

Here they are with some of the fittings installed.