Radiodetection RF Marker Ball – Sanitary / Sewer (Green) The Radiodetection RF Marker Ball – Sanitary / Sewer provides permanent identification of buried sewer and sanitary infrastructure. RF marker balls are passive, frequency-tuned markers that resonate when energized by a locator signal, enabling accurate underground utility identification without power or maintenance. Designed for long-term burial, this marker enables accurate locating with Radiodetection marker ball locators such as the MRX SG, MRX G, and MRX, without the need for tracer wire or active transmitters. Green color coding aligns with industry standards for sanitary and sewer utilities. Utility Type: Sanitary / Sewer Color: Green Part Number: 61/OMSANITARY-MK2 Packaging: Box of 30