15665-ZW1-030 Oil Level Pipe - Overview. The 15665-ZW1-030 Oil Level Pipe is a critical component within Honda marine engine lubrication systems. It supports the oil monitoring system by providing a clear and reliable visual indication of engine oil levels, helping maintain engine health and operational reliability. Designed specifically for Honda marine engines, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda