This HANSEN 4-ST QUICK COUPLER is a high-quality socket only with a 1/2 inch female NPT (FIP/FNPT) socket end diameter. It is made of durable brass material and is designed for use in various plumbing and industrial applications. The socket end is compatible with male NPT threads, making it easy to install and use. This product is sold in a lot of 3 and is perfect for those in need of quick couplers for their pipe and hose fittings.