DO YOU KNOW THIS: The 1/2 inch pex a washing machine outlet box is ONLY compatible with expanding fitting system, NOT compatible with crimp pex fitting system. Its inlets work well with 1/2 inch Pex-a pipes; the outlets fit well with 3/4 inch washing machine hoses. The pex a washer box features both central and side drains, which is easy to drain off water. PACKAGE INCLUDES: Pex-a Washing Machine Outlet Box*1; Pre-installed support bracket*2; Expansion Ring*4.