Part number ST0500600F41C is a 6" cast iron model 50 duplex strainer made by Eaton. The Eaton model 50 features two basket chambers. Divert flow from one to the other for easy basket cleaning without shutting down the pipe line. Perfect for applications that require constant uptime. The model 50 is an economical choice for a duplex strainer. It has some very helpful features that you will find on higher end models also, though. These include an integral lifting jack for the diverter plug, a quick open no-tool cover, and integrated NPT drain taps.