For Radiodetection locators in Montana, Utah, Wyoming, Northern Washington, Northern Idaho, (WA, ID, UT, WY, MT) please call:
Gary MossPVC pipe finders (non-metallic): GPR ground penetrating radar, RD1000, RD500, Knocker, Stopper - plastic pipe locator.
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GPR
GPR - Ground Penetrating Radar page
Ground Penetrating Radar Brochure
The Radiodetection RD500 locates all clean water pipes including PVC, Plastic, AC without tracer wires.
The RD500 is a patented PVC, plastic pipe locator valve that connects to the water supply pipes and creates 5 psi pulses higher than the pipe pressure. Then locate PVC pipe by listening with the Stethophon, Aquaphon, T10 or other acoustic leak detector for the loudest position.
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The Knocker connects to the outside of PVC plastic(non-metallic) pipes and taps on the plastic pipe, sending sound pulses down the pipes. The Knocker plastic pipe locator controls both the frequency and intensity of sound pulses, then you find the PVC pipe location with the Stethophon 04, Aquaphon, or RD500 receiver or other acoustic leak detector.
The Knocker works for all pipes in general. A water
pressure and flow is not needed. Connecting is quick and
easy.
The "Sewerin Stopper" connects to hydrants to located plastic,
PVC and non-metallic water pipes. In good conditions the
thumper locates plastic pipes over 1000 feet in each direction. Deeper pipes and softer soils reduce the maximum distance. Both the frequency and intensity of the pressure pulse are
controllable. 
Video of Sewerin Thumper plastic pipe locator in operation
The Combiphon Generator powers and controls both the Knocker and Stopper PVC pipe locators.
Plastic Pipe Locator Combiphon brochure