# Instructions for adding a penetrator For some applications of the Sounder, a penetrator will be required. We recommend an M10 cable penetrator for 6mm cable available through Blue Robotics. To pass the cable through the penetrator, the JST-GH 3-pin connector will need to be removed and re-installed once the cable is through the penetrator. Instructions on how to do this are as follows. Pry up on the tabs of the JST connector with a sharp object such as a hobby knife ![](/files/RrCRw4T8wBJCWXsxJT7e) Gently pull each of the three wires individually ![](/files/whOOHpP9zYlVZYr7YDav) Bend the tabs of the JST connector back down to their original position with the sharp object ![](/files/3yWHqFhsVJYDSc2uFymy) Pass the cable through the penetrator ![](/files/5JeIewcz8bYVHzdapSus) Replace each wire into the reused JST connector. Pin 1 is Shield (Yellow wire), Pin 2 is White, and Pin 3 is Black (or Red on newer units) ![](/files/kAk9RUCTu3NacQxVQ76i) Ensure each wire does not come out of the JST connector when gently pulled on ![](/files/GWZyl6nwFsMDdt1rHPwG) • If the wire comes out, the tab can be bent back down farther and the wire reinserted. • If the wires just won’t stay in the re-used connector, a replacement connector has been provided. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.ceruleansonar.com/c/s-500-sounder/technical-details/instructions-for-adding-a-penetrator.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.