91252-935-004 Water (15Mm) Seal - Overview. The 91252-935-004 Water (15Mm) Seal is a critical component in Honda marine engine systems designed to prevent water intrusion and leakage in the water pump assembly. This part supports the marine cooling system by creating an effective seal that maintains the system's integrity and ensures reliable engine performance. As a water seal with a 15mm dimension, it fits seamlessly in the water pump and vertical shaft assembly, playing a vital role in keepin