The Pentek CTAB-2-10-HF RO Element is the RO Membrane for Pentek, Ametek, Kleen Plus, US Filter RO Systems RO-2300NW, RO-2300, RO2300, RO-2300A, and RO-2300AT. Part number 155349-01.
Membrane should be replaced every 2 years.
View the Owner's Manual for the RO-2300