This Watts 5 inch hub funnel/strainer extension is engineered from cast iron for long life and durability. It is an ideal option for applications where there is no need for an additional strainer or grate and the primary use of the drain is as a receptacle for indirect waste lines. Additionally, it can be used as an extension piece to raise a strainer higher above the drain body; useful for thick concrete slab applications or when the drain body has been set below final pour level. It fits any Watts series FD-100, FD-200, FD-1100 or FD-1200 floor drains.