IPS’ Water-Tite MultiBox System is a strong and versatile plumbing outlet box for use in virtually any application to recess a plumbing connection. The system is available with numerous valve options, including fire-rated options, and can be installed in multiple configurations to meet the most confining design situations. It can be installed as a single-box system, an easy-to-connect two-box system, or a three-box system including a Studor air admittance valve. The outlet box can conveniently house both valves and a drain in the same box.