The four-way coupling with three internal BSP threads and one external BSPT thread type A20 is a versatile connector designed for reliable integration of pneumatic components, including hoses and fittings, within demanding industrial systems. Manufactured from durable nickel-plated brass, it ensures excellent resistance to wear, corrosion, and mechanical stress, making it suitable for long-term use in high-performance environments. With a working pressure of up to 60 bar, the coupling guarantees secure and efficient operation even under intensive conditions. To achieve optimal sealing, additional elements are required: for tapered threads, the use of Teflon tape or a dedicated sealant is recommended, while cylindrical threads demand aluminum or copper washers to maintain leak-free performance. This robust and precisely engineered component provides a professional solution for building safe, efficient, and durable pneumatic installations, ensuring reliability and stability across a wide range of applications.