The nipple coded K 27752 is a small but essential component that facilitates the connection of an indicator valve to the ZV40/48 diesel engine. Used primarily during performance diagnostics, this nipple provides a secure and pressure-tight interface through which cylinder pressure readings can be obtained in real time. Manufactured from high-strength, heat-resistant materials, it ensures safe operation even under high combustion pressures. Its role is critical during engine tuning, maintenance, and troubleshooting, as it enables precise monitoring of in-cylinder conditions without disassembly.