Pentair 1/4" x 5/8" 18-8 Stainless Steel Flat Washer

The Pentair 1/4" x 5/8" 18-8 Stainless Steel Flat Washer (part number 192120Z) is a precision-machined fastening component utilized across a wide variety of Pentair pool and spa filtration systems, including Clean & Clear Plus, FNS Plus, and Quad D.E. filters. Grade 18-8 stainless steel provides this heavy-duty washer with excellent resistance to rust and oxidation, making it highly durable in corrosive environments characterized by high humidity and constant exposure to pool chemicals like chlorine and acid. Structurally, it is designed to sit between the tension spring and the brass barrel nut on the main tank clamp band assembly, where it serves to evenly distribute the extreme tightening force across the surface area of the clamp mechanism and prevent the locking hardware from binding. This ensures a uniform, watertight seal on the tank halves while protecting the larger components from wear and distortion during routine maintenance. Because it is a small, slim hardware accessory, this individual washer is exceptionally lightweight, carrying a net product and shipping weight of approximately 0.01 pounds (less than 0.2 ounces).