Pentair 6" SM and SMBW Noryl Rotor Valve with Tapered Seal

The Pentair 6" SM and SMBW Noryl Rotor Valve with Tapered Seal (Product #: 073370) is a factory-original OEM replacement fluid-routing diverter engineered exclusively for heavy-duty, built-in side-mount backwash valves on classic pool and spa diatomaceous earth (D.E.) filtration systems. Specifically designed as the central mechanical component within the integral multi-port systems of Purex, Pentair, and PacFab SM and SMBW 2000 and 4000 series fiberglass filters (including popular models like the 4048 and 4060), this 6-inch rotor dictates the precise path of pressurized water through the tank. Precision injection-molded from Noryl™, a high-performance, modified polyphenylene ether ether-styrene blend engineering plastic, the rotor exhibits extreme dimensional stability, high tensile strength, and permanent immunity to aggressive pool chemicals, advanced oxidation from salt-chlorine generation, and concentrated winterizing agents. The key design feature is its specialized, factory-molded tapered perimeter seal, which is physically integrated to absorb rotational friction and establish an airtight, positive-pressure boundary between internal chambers. When an operator manually turns the valve handle to switch between filtration and backwashing, this tapered profile compresses tightly against the valve walls to eradicate internal fluid bypass or chronic weeping out of the backwash waste line under operational pressures up to 50 PSI. The physical dry product weight of this Pentair 6" SM/SMBW Noryl Rotor Valve is approximately 1.45 pounds (with a boxed shipping weight of roughly 2.0 pounds), providing pool service professionals and homeowners with a rugged, structurally rigid, and long-lasting internal sealing solution to restore nominal hydraulic performance to their legacy D.E. filtration setups.