DetailsPuRO Twist 2 Stage Quick Change Water Filtration Retro Fit System. PT2000-VH Includes one each of Q5605 and Q5633 filter cartridges. Works in place of the DuPure ® or ® Rayne "-60" Pure Blue - ® Omnipure -60 "Q" Series systems shown in the photo. Also used as the replacement for other systems preventing replacing the faucet. Since the system uses John Guest quick connectors it is very easy to install.