Quad-Ring® Butt‑Vulcanized are precision-manufactured seals where the ends of extruded elastomer cord are joined using heat and pressure in a mold, forming a seamless, high-strength, and leak-proof joint. Butt‑vulcanized Quad-Ring®s provide the performance of molded seals with the flexibility of cord extrusion, delivering high-quality, reliable sealing for custom, oversize, or non-standard applications, without the weaknesses of glued joints.