I'm using the cheap pools from
walmart. The parts are available at home depot. The hole I cut with a small utility knife (around $1.50).
3/4" x 1" PVC Male Adapter @ $0.77
3/4" Threated PVC Ball Valve @ $3.17
Two #11 O-Rings (3/4") @ 1.97 for 10 pieces
All pieces are available at Home Depot or other hardware store. Make sure to cut your hole as tight as possible. Put the Male Adapter with an o-ring inside of the pool, add another o-ring outside and screw on the ball valve. No glue needed. Really simple.
You can also buy a hose adapter, which you can screw into the outer part of the ball valve. This enables you to connect a garden hose to it, so you can have the dirty water discharge anywhere in the garden.
3/4 In. x 3/4 In. MPT x MHT (Male Hose Thread) PVC Hose Thread Adapter @ $0.99
The prices given are from Home Depot. They do not include sales taxes. Take this list with you to the hardware store and have someone help you. Make sure they all screw together before you leave.