The Most Flexible and Feature-Rich Multi-Outlet Device on the Market, Ideal for New Projects and Retrofit Applications. The only multi-outlet device on the market with 8 configurable ports and 10 flow options for each port for maximum flexibility. XBD-80 and XBD-81 models each contain a built-in filter. Makes retro-fitting easy when installed with the optional in-stem pressure regulator. Easy to maintain, because the body can be easily removed from the riser. For optimum performance, drip emitters must be installed inside the Xeri-Bird device to help prevent back pressure leaking. See the photo examples to the right.