The quick-connect plug with external NPT thread is a lightweight and highly efficient solution designed for versatile use in water, chemical, and pneumatic installations. Available with or without a shut-off valve, it stands out from traditional heavy-duty couplings by offering significantly reduced weight while maintaining durability and reliability. Its advanced valve system ensures high flow capacity with minimal leakage, supporting smooth and safe operation even in demanding environments. The design allows for slight rotation of the connected hose, effectively preventing twisting and reducing the risk of accidental disconnection, which enhances both safety and convenience. Manufactured from robust polypropylene and equipped with an EPDM O-ring seal, the coupling guarantees long-lasting performance under working pressures up to 4.2 bar and within a temperature range of 0°C to +71°C. Thanks to its versatility, it is perfectly suited for applications such as chemical photographic processes, filling systems for batteries and accumulators, sprayers, pneumatic circuits, and installations with non-freezing liquids. Its compact length and ergonomic construction make it an excellent choice for professionals seeking efficiency, reliability, and ease of use in modern industrial and technical systems.