Hi, Scott H!
Thank you for your question. The difference between the R10000-UNWS and the R10000-UNBX is that the R10000-UNWS includes "stops". These stops allow you to shut the water off at the faucet instead of shutting off the water to the whole house, if you need to do maintenance or repairs to the faucet. With a flat head screwdriver, you would adjust the stems clockwise to close and counterclockwise to open.
Date published: 2018-11-07