The QC4 quick coupling socket is a precision-engineered solution designed in compliance with the Instrumentation Standard, equipped with an integrated valve and available with external NPT, BSPT, or BSP threads. Manufactured from durable AISI 316 stainless steel, it ensures exceptional resistance to corrosion and demanding operating conditions, making it ideal for use in aviation, gas industry, medical technology, pharmaceutical production, and laboratory environments. Each coupling undergoes rigorous factory testing at 68 bar to guarantee absolute tightness, while its robust construction supports a working pressure of up to 206 bar. With a wide operating temperature range from -26°C to +204°C and reliable viton sealing, the QC4 delivers consistent performance even in extreme applications. Fully interchangeable with other Instrumentation Standard quick couplings, it offers maximum flexibility, safety, and efficiency for critical processes where reliability and precision are essential.