ST052160AF40C is the part number for a 16" cast iron Eaton model 52 duplex basket strainer. Used for applications that require zero (or minimized) downtime, the model 52 features a duplex basket design. Dual butterfly valves work in synch to divert flow from one chamber to the other. This method results in minized pressure loss and a quick reliable chamber switch. The empty chamber's basket can then be cleaned out without shutting down the entire pipe line. Features include quick open cover, compact footprint, perforated or mesh SS baskets, and more.