Pentair .25" 20 Brass Wing Nut Kit

The Pentair 1/4"-20 Brass Wing Nut Kit (OEM Part #35402-0074Z / #35402-0074) is a specialized mechanical fastener kit engineered for Pentair Sta-Rite Diatomaceous Earth (D.E.) filtration systems, most notably the System 3 SD Series (models S7D75 and S8D110) and DEP/DES Series vertical grid lines. Forged from high-grade, marine-strength brass alloy, this corrosion-resistant wing nut is designed to survive constant submersion in chemically treated, high-pressure pool water without scaling, rusting, or binding. It threads directly onto the top of the internal 1/4-inch vertical tie rod, serving as the final anchoring point that manually compresses the upper plastic manifold down against the internal filter grids. This tool-free, hand-tightened compression secures the entire internal grid core into a completely rigid, parallel matrix, preventing structural shifting or internal water bypass during intense pump filtration or high-velocity backwash cycles. Because it is a compact hardware element, the kit has an ultra-light actual product weight of roughly 0.05 to 0.10 pounds (under 2 ounces), and ships in padded small-parts envelopes or miniature boxes with a packaged shipping weight of approximately 0.20 to 0.30 pounds to protect the precision-cut internal threads during transit.