RIDGID 24518 SR-20 Top Case Assembly. RIDGID's SR Series SeekTeck Locators are handheld locators designed to find lines and beacons. These Locators are designed and competent to locate in poor conductors, poor soil conditions or even poor grounding conditions. These Locators can track any frequency from 10 Hz to 93,000 Hz. This RIDGID 24518 SR-20 Top Case Assembly is a genuine replacement part manufactured by RIDGID for SR-20 Locators. The RIDGID 24518 SR-20 Top Case Assembly is fully covered under RIDGID's 3-year limited performance warranty and lifetime warranty to be free of material defects.