The 4OFS Nut from Fittings Unlimited Inc is a compact and reliable component for secure connections. With a 4mm size, this nut is designed to fit various fittings, ensuring compatibility across systems. Constructed from high-quality materials, it provides excellent resistance to corrosion and wear, making it suitable for HVAC and plumbing applications. This nut meets industry standards for safety and performance, offering peace of mind for users. Its small size allows for easy installation in tight spaces, making it a versatile choice for professionals.