Abstract: A starter switch arrangement for boats, where the switch may be subjected to water splash or the like. The arrangement includes a key with a gripping component and an insert component to be inserted into an aperture in the switch for opening and locking the switch. The key has a cover component positioned between the gripping and insert components and provided to be sealingly supported against the switch in the inserted position of the key during the utilization of the boat. The cover component will sealing close a portion of the switch around the aperture of the switch.