The sealing ring K 87177 is a durable and high-pressure-resistant gasket specifically designed for the block-ball cock K 87165 within the ZV40/48 fuel supply system. Its primary function is to provide a tight, long-lasting seal that prevents any leakage around the valve mechanism, even under pulsating fuel pressures and significant thermal changes. Manufactured from resilient, fuel-resistant materials, this sealing ring ensures stable valve performance, preserves system safety, and minimizes the risk of contamination or loss of pressure. By safeguarding the integrity of the fuel line, K 87177 plays an essential role in maintaining operational reliability and extending the service life of the valve assembly.