Quick Pitch Universal Center Ring QPUCR-108 The Quick Pitch Universal Center Ring is designed to accommodate 2" and 3" shower drains, square drain risers and most other specialty shower drains. The center ring comes with two inserts 2" and 3" to match the threaded riser portion of the drain with a 6"(inside) diameter top ring to accommodate the square or over sized drains which to attach the Quick Pitch Standard float sticks. The Extra Float Stick Kit XFS-101.2 is recommended for use with this ring.