The F204 08 05 Silver Sleeve- No Core R-4.2 from Mueller Streamline is a specialized component designed for enhanced performance in various applications. This silver sleeve features a unique design without a core, allowing for improved fluid dynamics and reduced turbulence. With a rating of R-4.2, it provides excellent thermal insulation, making it suitable for both heating and cooling systems. Constructed from high-quality materials, this sleeve ensures durability and resistance to wear. Its compatibility with standard fittings makes it an ideal choice for upgrading existing systems or for new installations.