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  1. Smart RV
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  3. Monitoring System
  4. Water Tanks
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Horst Miracle Probe Sensors for RV Gray Water Tanks - Qty 4

Horst Miracle Probe Sensors for RV Gray Water Tanks - Qty 4

Item # T21302VP
Retail:$40.66
Our Price: $26.94
You Save: 34%
Smart RV
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Shipping Weight: 0.14 lbs
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Get an accurate reading of waste levels in your RV's gray-water tank. Extra-long sensors are surrounded by Teflon to prevent false probe contact and incorrect sensor readings. Fits 3/8" diameter holes. Connects to existing wiring. Great Prices for the best smart rv from Valterra. Horst Miracle Probe Sensors for RV Gray Water Tanks - Qty 4 part number T21302VP can be ordered online at etrailer.com or call 1-833-496-1390 for expert service.
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  • Reviews (77)
  • Q & A (0)
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  • Why etrailer?

Valterra Smart RV - T21302VP

  • Monitoring System
  • Water Tanks
  • No Display
  • Valterra

Get an accurate reading of waste levels in your RV's gray-water tank. Extra-long sensors are surrounded by Teflon to prevent false probe contact and incorrect sensor readings. Fits 3/8" diameter holes. Connects to existing wiring.


Features:

  • Provides an accurate indication of waste levels in your RV's gray-water tank
  • Prevents false probe contact and incorrect sensor readings
    • Delrin body and Teflon tube surround sensor to prevent liquid residue or sludge from sticking to sensor
    • Considerably longer than standard probes to prevent false readings from buildup on sides of tank
  • Easy to install - fits 3/8" diameter holes
    • Use existing holes or drill new holes next to existing probes
  • Designed for RVs built to RVIA, CSA, and IAPMO standards
  • Connects to existing wiring and monitors
  • Quantity: 4 probes


How Miracle Probes Work

The monitor for your RV's gray water tank shows a full reading when electricity is flowing between the tank's sensors. This circuit of electricity is completed when there is water or sludge in your tanks. If your empty tank is showing a full reading, that means water and sludge has built up on the sensors or the sides of the tank. This buildup completes the electrical circuit to give you a false reading.


Teflon Tube on Horst Miracle Probe

Unlike other sensors, which are prone to false readings due to buildup, Miracle Probes are surrounded by Teflon. The Teflon covers each Miracle Probe like a roof, helping to prevent liquid residue or toilet paper from building up on the probe. In addition, Teflon is not a conductive material and sludge cannot stick to Teflon. Miracle Probes are also longer than standard sensors, which prevents the probes from making contact with sludge that builds up on the sides of the tank.


Because sludge cannot build up on the Miracle Probes, a complete electrical circuit is only made when your tank is full and the water or sludge in the tank makes contact with the copper tips of the probes. This means that you'll only see a full tank reading on your monitor when your tank actually needs to be emptied.


Installation

The probes easily install into your RV gray water tank's existing 3/8" diameter holes. You can also drill new holes next to the existing holes.


First, remove the existing sensors from the holes in your gray water tank and replace them with the Miracle Probes. Once you have pushed the Miracle Probes into the holes, tighten the nut on each probe to create a leakproof seal. Then connect existing wiring to the new probes.


Once installed, rotate the exterior stud so that the milled flat section of the stud is aiming down and the Teflon roof is covering the copper tip of the probe.



T21302VP Valterra Horst Miracle Probes for Motorhome Gray Water Holding Tanks - Qty 4




California residents: click here


Customer Satisfaction Score:


Customer Reviews

Horst Miracle Probe Sensors for RV Gray Water Tanks - Qty 4 - T21302VP

Average Customer Rating:  4.7 out of 5 stars   (77 Customer Reviews)

Get an accurate reading of waste levels in your RV's gray-water tank. Extra-long sensors are surrounded by Teflon to prevent false probe contact and incorrect sensor readings. Fits 3/8" diameter holes. Connects to existing wiring.

by:

Ordered latch and hinges (heavy) for Cargo trailer door and new tank sensors (very light and somewhat delicate) for our RV. Arrived in just a couple of days packed all in one perfect box with excellent packaging. Another site should take lessons from etrailer. Great price AND made in the USA!




by:

Replaced sensors in the gray water tank on my motorhome. Working great.




by:

Happy with this product as I am with black water version. Had them drop shipped to ETI where trailer was built. So far they are functioning flawlessly.




by:

Great service, arrived early, just what we needed, and the price was the best we found. will be a return customer no doubt.


Comments
No issues working as advertised.
Mary - 06/25/2020


by:

Best probes going not I feel confident that my tanks will not over flow.




by:

Fast shipping. Prices & shipping are so so. Have not installed the product yet but looks as advertised.




by:

Fast shipping and Product is reasonably priced. Installed and work Great




by:

as alsways greet job on shipping & price thankyou Jim T




by:

Great product very easily installed.




by:

They are as described. fast shipping




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by:

Just received and have installed. Time will tell.
Ordering was easy and they arrived on time.




by:

Installed pretty easy.




by:

delivered as described,happy buyer




by:

Easy install and works great




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by:

Review from a similar Horst Miracle Probes in Smart RV


I got them a few days ago and today I installed them with little or no trouble. When I finished the tank level display showed empty. So I filled the tank with water to test them, and so far they are working well. After filling and emptying the tank the level indication returned to empty.




by:

Review from a similar Horst Miracle Probes in Smart RV


For a while, this will just be a review of etrailer as the installation of these probes will be 'another day' since the belly cover of our Montana will need to at least partially come down and this is just not a good time.

etrailer has been great so far :-}




by:

Review from a similar Horst Miracle Probes in Smart RV


Wonderful product. Soooo easy to install (drill new hole, insert probe correctly oriented and gently tighten seal jam nut, transfer electrical wire and secure - DONE) I have had no reoccurrence of error readings. Highly recommended. Excellent on time delivery. I am so pleased with this product.


Comments
I am getting 12 and 34 readings when empty. I will do a good tank flush and rotary spray and I am sure it will all be good.
Gary - 08/28/2019


by:

Review from a similar Horst Miracle Probes in Smart RV


Worked as expected. Thanks




by:

Review from a similar Horst Miracle Probes in Smart RV


The black tank sensors were very easy to install. My old sensors are spin welded so I had to drill new holes. There were no instructions included but are available on the net. If manufacturers would pay attention to the fine print, "place the bottom - sensor 8" to 13" away from the others." we wouldn't have so much trouble with the readout.


Comments
The new tank sensors make the KIP unite work right when mounted in the tanks 8 inches away from the bottom sensor.
Rgill - 02/05/2018


by:

Review from a similar Horst Miracle Probes in Smart RV


These sensors have a plastic hood that prevents the buildup of solids and tissure paper that produce false readings. These sensors don't provide as much data as something like the SeeLevel system, but for most casual full-hookup-to-full-hookup campers, they are plenty good enough.




by:

Review from a similar Horst Miracle Probes in Smart RV


These were easy to install. Most RV tanks have 3/8 inch holes but the old ones can be real stubborn to remove. I remove the electrical cable, loosen, not remove, the nut closest to the washer, then use curved needle nose pliers to give some decent leverage, you may find the bulged rubber won't give without tearing the rubber (not the tank) or a portion might drop back inside the tank. They'll likely just flush out eventually but a 3/8 wood bit drilling new holes can work too. Then installing was simple just make sure the flat part on the threaded part is level so your probe shield is aligned to protect the probe.




by:

Review from a similar Horst Miracle Probes in Smart RV


They appear to help some with false readings but still have to rinse the black and grey tank after each dump to clean the sensors. Have to fill the tanks up with fresh water and dump a second time to clean the sensors so they work properly.




by:

Review from a similar Horst Miracle Probes in Smart RV


I installed these on both black and gray water tanks in our 1995 Itasca "Sunrise". Installation was straight forward with no unexpected issues or obstacles. They have functioned as advertised and provide much improved level readings for the tanks. I would note that I take time to rinse and flush the tanks after dumping and use a down the toilet spray wand for better cleaning.



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See what our Experts say about this Valterra Smart RV

  • Can Horst Miracle Probe Sensors T21302VP Install in Fresh Water Tank
    Based on how they work I can't see how the sensors wouldn't work in a freshwater tank. Our contacts at Valterra have said it can work just fine in either. I attached a picture of the back of the package that has the instructions for installing them.
    view full answer...
    Image 1 for
  • Plugging Sensor Holes for RV Black Water Tank Level Sensors
    Best option we'd have would be to put "dummy" sensors back in place of the popped out plugs like with # T21302VP or to go and create your own plug which you could do by sourcing a grommet designed to fit a 3/8 inch diameter hole and also a size bolt that would fit snugly in the grommet which would seal it to the tank. So basically you'd want a bolt that is slightly larger than the opening of the grommet so that when it's threaded in it presses tightly to the tank to seal it.
    view full answer...
  • Gray Water Tank Probe/Level Indicators for RV with Monitoring System that Doesn't Work
    The Horst Miracle Probes, # T21302VP, can be used on your RV with the existing wiring. If your current system is set up to read full, 2/3 and 1/3 then you could just use 2 or 3 of the probes as needed. But most measure 1/4, 1/2, 3/4, and full so if yours is the same way only using 2 or 3 of the probes may prove to be inaccurate. But if you wanted you could use as many of the 4 probes as you wanted. This is the only gray water level monitoring system that we have.
    view full answer...
  • Why is Horst Holding Tank Sensors Sold in Pack of 4
    The Horst Miracle Probe Sensors # T21302VP are sold in packs of four so that you can replace all of them at the same time to get an accurate reading.
    view full answer...
  • Can Valterra Horst Miracle Probe Sensors for Black Water Tank be Used in Gray Water Tank
    I spoke with my contact at Valterra regarding the Horst Miracle Probe Sensors for Black Water Tanks # T21301VP referenced in your question. She stated that there is no reason you could not use a couple of the black water probes in your gray water tank. The primary difference between these and the Gray Water Probes # T21302VP is that the black water probes feature an extra coating/seal to protect them from debris. These sensors will work great in your tanks to provide an accurate indication...
    view full answer...
  • Horst Miracle Probes for Gray and Black Water Tanks
    For a Horst Probe for a black water tank you would want the part # T21301VP for a quantity of 4 or for a gray water tank you would need the part # T21302VP. The probes of these kits are straight and are not a knock-off. There was a design change though which helps prevent debris getting caught in the tank. If you check out the picture I attached you will see what was prone to happen with old design.
    view full answer...
    Image 1 for Image 2 for
  • Grey And Black Water Tank Sensor Recommendation For A 2013 Jayco Eagle Premier 5th Wheel
    For your 2013 Jayco Eagle Premier 5th Wheel, I recommend checking out the: -Horst Miracle Probe Sensors for RV Black Water Tanks # T21301VP for your black water tank, and, -Horst Miracle Probe Sensors for RV Gray Water Tanks # T21302VP for your grey water tank. These sensors will fit into 3/8" diameter holes, and will work in place of existing holes or you can drill new holes next to the original holes.
    view full answer...
  • Recommended Black, Gray Water, and Fresh Potable Water Sensors for Level Monitoring System
    We do not have any monitoring system for your water levels. We do however carry the sensors for the tanks that will connect to those monitoring systems. You can make your own system without a monitor with a simple light connected to a battery. You would simply connect power to the lowest level sensor an then mount a sensor at the desired level or levels and connect the positive wire of the light to the sensor and the ground of the light to any grounded metal surface. I recommend using...
    view full answer...

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Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
Employee Amy B
Written by:
Amy B
Employee Mary E
Updated by:
Mary E

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