Radiodetection Sewer Sonde (33 kHz) The Radiodetection Sewer Sonde (33 kHz) is a self-contained, battery-operated transmitter designed for locating non-conductive underground utilities such as sewer lines, pipes, and ducting. Transmitting at 33 kHz , it delivers a strong, stable signal that can typically be located to depths of up to 26 ft (8 m) using compatible Radiodetection locators. With a compact, rugged housing measuring 2.51 in × 6.61 in (64 mm × 168 mm) , this sonde is well suited for connection to a Flexrod or similar push system, making it ideal for tracing underground routes in confined or hard-to-reach environments. Part Number: 10/SONDE-SEWER-33 Key Features 33 kHz transmit frequency Locatable to 26 ft (8 m) Self-contained, battery-operated design Compact size: 2.51 in × 6.61 in (64 mm × 168 mm) Compatible with Flexrod systems Designed for non-metallic pipes and ducting Ideal For Sewer and drain inspection crews, utility locators, municipal maintenance teams, and contractors tracing non-conductive sewer lines, pipes, and underground ducting.