Radiodetection RF Marker Ball – Water (Blue) The Radiodetection RF Marker Ball – Water is a passive underground marker designed to permanently identify potable water utilities. 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. Installed during construction or maintenance, this marker ball provides a long-term reference point that can be easily located from the surface using compatible Radiodetection marker ball locators such as the MRX SG, MRX G, and MRX. Color-coded blue for water services, this marker ball helps reduce excavation risk and improves future utility identification and asset management. Utility Type: Water Color: Blue Part Number: 61/OMWATER-MK2 Packaging: Box of 30