O-rings and gaskets are not a specific brand but a category of sealing products used in various industries. These components are manufactured by numerous companies worldwide, including prominent ones like Parker Hannifin (USA), Freudenberg Sealing Technologies (Germany), and Trelleborg (Sweden). O-rings are circular elastomeric seals designed to prevent leaks in mechanical systems, while gaskets are flat seals used to fill gaps between mating surfaces. These products serve critical roles in industries such as automotive, aerospace, oil and gas, and manufacturing. Leading suppliers like Grainger and Radwell distribute these components from multiple brands, offering materials like nitrile, silicone, and Viton® for diverse temperature and pressure conditions.