Mercury - Isolater Port - 8M0179373. Ensure reliable sensor signal routing with the Mercury Isolater Port - 8M0179373, an OEM component designed to support proper isolation of pressure sensors in your marine engine system. Engineered for durability and precision, this isolator port helps maintain accurate readings and stable engine performance by preventing pressure signal interference between systems.. Key Features. Genuine Mercury OEM Part - Manufactured to exacting factory specs for a seamles