From the visitor center, drive north along the Hapers Corner Road for 4.2 miles to the Plug Hat Picnic Area. Park here.
Complete the Main Fork as described here
If a car shuttle is available, this exit has a bit less elevation gain. After enjoying the Magic Chamber, head down canyon. At the first convenient route, climb out of the canyon on the south side. Head up to the rim (very steep!) and then head cross country up to the point near the 6800-foot contour. From there, follow the rim of Bull Canyon to the Plug Hat Picnic Area.
Several slings (bring 60 feet minimum), 6-10 rapid links or rappel rings, one 60 meter rope, one 15 meter rope, and a climbing harness. There may be short wades in the slot, but probably never any swimming, so go prepared for that.