FTP-8 | 512 Hertz Flushable Transmitter

5.00 out of 5 based on 1 customer rating
(1 customer review )


The FTP-8 flushable transmitter works in cast iron and nonmetallic lines along with septic tanks. The flushable transmitter uses the 512 Hz frequency and will work with our Digital LineFinder series along with the Ferris analog receiver.

  • Black On/Off push button
  • Floats for easy retrieval
  • Flashing LED indicates that the sonde is transmitting
  • Red LED will come on to indicate when the battery is no longer good
  • Batteries are not replaceable
  • Eyelet for easy attachment to a fishing line
Get a 12.5% discount on flushable transmitters when you buy 20 or more
All flushable transmitters ship FedEx 2-day for the price of Ground. Just select Ground shipping at checkout. 
SKU: 00-221-FTP8 REV J Categories: ,

512 Hz Flushable Transmitter

Frequency: 512 Hz
Dimensions: 2-1/4” L x 1-3/16” W x 1” H
Weight: 0.8oz
Line size: 3 inches and up
Range: 8 +/- feet in cast iron
12 +/- feet in nonmetallic
Range is determined under best conditions using a Prototek Receiver
Signal tone: Continuous
Battery: 5 +/- hours
On/Off: Push Button
Best Use: Flushed
Receiver Type: Prototek Linefinder 2000 or 2200 or any 512 Hz Receiver.  (Will not work with the Ardy receiver.)


Affordable! Flushable! Floatable! Reusable!

Made in the U.S.A.

Prototek’s Blue FTP-8 512 Hertz Flushable Sonde Transmitter is the Gold Medal Standard for flushable sonde transmitters. First off, you must have a 512 Hertz receiver to use these transmitters as they will not work with an AM/FM radio or with an app on your Smartphone device. These flushable transmitters are perfect for locating Septic Tanks and in addition to an affordable price, these little blue magic pills have a four hour battery lifespan and can float. Therefore, you could easily retrieve the transmitter, and after a quick yet thorough cleaning, use each transmitter at least three more times!

However, while we here at Prototek recommend using the Ferris FR-1 Receiver or either of our LineFinders, the LF-1 or the LF-3, these amazing little blue transmitters will be able to work with any 512Hz Receiver, whether it is a Made in America Prototek Ferris Receiver, one of our LineFinders (Also Made in America!) or an off brand 512 Hertz Receiver.

The FTP-8 512 Hz Flushable Transmitter is perfect for a Do It Yourselfer’s small project around the house or for a Septic and Sewer Company looking to Pump in the Profits and Dump out the Competition. Remember, you must have a 512 Hertz Receiver! We’ve got three!

Looking to have this product delivered to Canada? Check out our 3 pack of FTP-8 512 Hz Flushable Transmitters on Amazon that can ship to anywhere in North America! In other words, let’s say you live on the shores of the Arctic Ocean in the Northwest Territories. Prototek’s got you covered, eh?

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: Will the FTP-8 work in cast iron?
A: Yes

Q: Can I use the flushable transmitters on the end of a sewer machine or push rod?
A: We do not recommend it. Using the flushable transmitters in this way will void any warranty. We do recommend many of our other DuraSonde transmitters along with a spring carrier for this type of use.

Q: Do the flushable transmitters float?
A: Yes they do.

Q: What receiver do you recommend for use with the FTP-8’s?
A: We recommend the Ferris Analog Receiver and both of our LineFinder digital receivers. It just depends on how much you want to spend and what type of locating you are doing.

Q: How do I calculate depth?
A: To calculate depth you will take the distance between your front and back nulls and then multiple by .7.  An example would be if you measured 50 inches between your front and back nulls then you would multiply 50 x .7 = 35 inches.

Q: Do the flushable transmitters fit in a spring carrier?
A: No. They are too wide. Our FD-10, FD-20 and HD-40 DuraSondes fit in all our spring carriers.

1 review for FTP-8 | 512 Hertz Flushable Transmitter

  1. Reviewer profile image
    5 out of 5

    Robert Bye

    works well

    This is a good affordable flushable transmitter .

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Additional information

Weight .08 lbs
Dimensions 1 × 1 × 1 in