Tracy, I use a 7/8" bit for 1/2" pvc, and a 1 1/8" bit for 3/4" pvc. I've had the best luck with forstner bits. Hole saw bits cut the cleanest hole, but they are a PITA. They have to be cleaned after every hole.
FWIW I drill PVC in steps if I want larger holes. Small pilot bit, bigger bit, bigger bit still....I suspect a stepped bit would also work.
Bill, I agree. A large enough step bit did work great, I just didn't have one big enough.
I'd never even thought about old water hose, just black tubing. We've got hundreds of feet of old hose ourselves. I'll add that to the mix.
