The automatic starting-air stop valve arrangement K 43550 is an important part of the starting-air control system of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine, designed to support the controlled admission and interruption of compressed air during the engine starting sequence. The arrangement incorporates the automatic starting-air stop valve and its associated components and connections, providing the mechanical and pneumatic interfaces necessary for coordinated operation within the starting system. Its principal function is to ensure that starting air is supplied when required and reliably shut off when the corresponding control conditions demand it, helping prevent unnecessary air consumption and undesirable pressure conditions. Accurate valve positioning, correct installation of associated piping and connections, reliable sealing, and proper interaction with the engine's starting controls are essential for dependable performance. During operation, the K 43550 arrangement is subjected to repeated pressure changes, vibration, temperature variations, and extended periods of standby readiness, requiring reliable operation of all interconnected components. During maintenance or overhaul, the complete arrangement should be inspected for leakage, corrosion, damaged connections, sticking mechanisms, incorrect alignment, and deterioration of sealing elements, while its opening and closing functions should be verified according to the manufacturer's procedures. By providing coordinated automatic control of the starting-air supply, the K 43550 arrangement contributes to safe engine starting, efficient compressed-air utilization, protection of associated starting-system components, and dependable operational readiness of the ZV40/48 engine.