The 1/8" FS SQ HD PLUG by Capitol Manufacturing is a durable square head plug designed for sealing threaded openings in piping systems. This fitting features a 1/8 inch female socket and is constructed from high-quality materials to ensure a secure and leak-free seal. Ideal for various applications, including plumbing and HVAC, it meets industry standards for pressure and temperature ratings. The square head design allows for easy installation and removal, making it a practical choice for maintenance and repairs. This plug is essential for preventing fluid loss and maintaining system integrity.