The 4 Brass Nut with Plastic Sleeve from Fittings Unlimited Inc is a reliable component for various plumbing and piping applications. This fitting features a durable brass construction that ensures longevity and resistance to corrosion. The included plastic sleeve provides added protection and enhances the fitting's performance. With a size of 4, it is compatible with a range of systems, making it a versatile choice for both DIY projects and professional installations. This nut is designed to provide secure connections and maintain optimal flow.