Flomatic 4221LSS2 Stainless Steel Submersible Check Valve – Model 100MSS | Pump Professionals

The Flomatic 4221LSS2 is a stainless steel submersible check valve from Flomatic’s Model 100MSS series, engineered for long-term performance in underground and submerged installations. Built to handle the rigors of well-water environments, this valve provides reliable one-way flow control that protects pumping systems from backflow and water-hammer damage.

Constructed from 316 stainless steel, the 4221LSS2 stands out as a premium 316 stainless check valve designed to resist corrosion, scaling, and mineral buildup commonly encountered in well and groundwater systems. The Flomatic 100MSS series is known for its robust all-metal construction, and this model carries that reputation with a durable body and sealing components rated for continuous submersible service. As a well pump check valve, it is sized and rated to handle the flow demands of residential and light-commercial submersible pump systems without compromising performance. The submersible pump check valve SS design ensures compatibility with potable water applications while withstanding the abrasive and corrosive conditions found deep in water wells. Its compact profile allows it to fit within standard well casings, making installation straightforward for well drillers and pump contractors alike.

The Flomatic 4221LSS2 is ideally suited for submersible well pump installations, deep well water systems, and groundwater extraction applications where corrosion resistance and long service intervals are critical. It also performs reliably in irrigation pump systems, geothermal wells, and other submerged fluid handling environments where stainless steel construction is preferred over plastic or cast iron alternatives. For contractors and well system designers seeking a dependable, corrosion-proof check valve for demanding below-grade installations, this model delivers the durability and performance needed for years of trouble-free operation.