USABlueBook - Omni Marker™ Marking Ball, Green (Sewer)
Enhance Safety and Reduce Costs by Permanently Marking Buried Plant
0162-0001-1 Omni Marker Buried Utility Marker, Sanitary, Green, Electronically marks and relocates buried facilities By BcTlyInc Ship from US" - Walmart.com
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Tempo OM-08 Omni Marker II, Water [BLUE], 145.7 kHz