40107-ZW1-700 Case (Lower) Grom - Overview. The 40107-ZW1-700 Case (Lower) Grom is an essential Honda marine engine rigging component. It supports the engine's protective sealing system by providing a durable, vibration-dampening seal at the lower case connection. This integration helps maintain water resistance and structural integrity for reliable and efficient engine operation. Engineered precisely to factory specifications, this component ensures seamless integration with existing parts, mai