The multi-use O-ring K 70017 is specified to seal interfaces on several ZV40/48 components — typically the cooling/raw water pump (K 73100), a related assembly K 73000, and the fuel transfer pump K 74100. Built to resist both oil and seawater exposure as well as thermal cycling, this O-ring keeps diverse fluid circuits leak-free and preserves pressure integrity across systems. Because it services different assemblies, stocking this part simplifies logistics and helps technicians rapidly restore tight seals during troubleshooting or overhaul.