FD-20 | 512 Hertz DuraSonde Transmitter


The FD-20 is the most popular transmitter in our 512 Hz line for locating in cast iron and nonmetallic lines. And now with its new more durable design the FD-20 is ready to transmit even in the toughest terrain.

  • Steel head for durability
  • Encased in a strong polycarbonate tube
  • Watertight
  • Brass battery cap and 1 AAA alkaline battery included
  • Will work with any receiver that uses the 512 Hz frequency
  • For best results use one of Prototek’s Digital LineFinder Receivers
  • Our Spring Carriers are recommended to help protect your transmitter
  • Prototek Battery Caps available for use with pushrods (sold separately)

All transmitters ship 2-day for the price of ground. Just select ground at check out.

SKU: 00-221-FD20 Categories: , ,

Q: Do you have a product that will help protect my DuraSonde transmitter in the pipe?
A: Yes. You can check out one of our Spring Carriers.

Q: Will it go through cast iron?
A: Yes it will. 512 Hz is perfect for locating in cast iron. It gets 15 feet in cast iron and even better range in nonmetallic lines up to 20 feet deep.

Q: Why am I not getting the full range?
A: There can be many factors. First off, always make sure you have a new battery. Second, keep in mind the soil composition of the area where you are locating. Third thing is the wall thickness of the pipe you are locating in. These are just a couple of the factors that can affect the signal strength of the transmitter.

Q: I am using a receiver other than Prototek and I am not getting the range that you advertise on your website. What is the deal?
A: Our receivers are very sensitive, they tend to pick up the signals a little better than others. All our ranges posted on our website are determined with our receivers. We can’t guarantee what you will get with other brands of receivers.

Q: Can I attach this directly to a sewer machine?
A: Yes you can, but we highly recommend that you buy a spring carrier to help protect and extend the life of your transmitter.


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