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

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

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RV Sewer T21301VP - Probe Sensors - Valterra
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Get an accurate reading of waste levels in your RV's black-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. Lowest Prices for the best rv sewer from Valterra. Horst Miracle Probe Sensors for RV Black Water Tanks - Qty 4 part number T21301VP can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Valterra RV Sewer

  • Sewer System Maintenance
  • Probe Sensors
  • Valterra

Get an accurate reading of waste levels in your RV's black-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 black-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 black 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 black 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 black 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.



T21301VP Valterra Horst Miracle Probes for Motorhome Black Water Holding Tanks - Qty 4

Item # T21301VP




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Customer Reviews

Horst Miracle Probe Sensors for RV Black Water Tanks - Qty 4 - T21301VP

Average Customer Rating:  4.7 out of 5 stars   (63 Customer Reviews)

Get an accurate reading of waste levels in your RV's black-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.

- T21301VP
by:

Removed the shorted out old probes and slipped these in and they work just fine. 653540



- T21301VP
by:

These probes are exactly as shown. They installed easily once you removed the old probes. I emptied water into the tanks and the probes read correctly. The only thing i changed was the size of the metal washers that went between the nut and rubber bushing. I used the ones with the hood on them. Will see if they are effective the next time we camp. 563937



- T21301VP
by:

No more 2nd guessing the black water levels. The probes perform as advertised and O haven't had a single false readout since installation. Easy to install. My high, high probe was a little hard to.reaxh, but that was due to the trailer configuration, and not the probe design. 574340



- T21301VP
by:

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. 569333



- T21301VP
by:

I replaced and old set of horst probes thinking that they may not have been the new improved ones with the guard around the probe. My first set ( factory installed ) worked well for a few months then became problematic. They did have the nylon guard(s), however, I replaced them anyway and have had the same results with the replacement ones. The sensor placement in the black tank from the manufacture could be a contributing factor as they are located at the end of the tank where it drains and not on the side where most manufactures place them. Mine are stacked directly over each other in a vertical line. Does not seem to be the best placement from what I have been able to research. 670887



- T21301VP
by:

I installed these in the virtical side of my blackwater tank. Original had qtr. and half on an angle snd I did not think that was right. On trip next week and will see how they work. Had to patch in some wire to reach. 314565



- T21301VP
by:

I installed the probesin my black tank soon after I got them I found that I could not install them in the holes of the old ones so I plugged those holes with bolts and Silicone. The one's I purchased for the other tanks I haven't installed yet. I will install them before spring. I think the new probes are a little better but I still get wrong readings. It was difficult drilling holes because of the space around the tank 570615



- T21301VP
by:

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. 895825



- T21301VP
by:

these work great 847599



- T21301VP
by:

I am thoroughly pleased with these extensions, the ones previously on my RV frequently leaked, causing problems these have performed with no issues since installed over a year ago. 789794



- T21301VP
by:

The service was great Ordered the sensors on good Friday, got them before noon on Monday I have had 11 motor homes starting in 1976 and never had a bad sensor until now. A 2 year old motorhome home only used a couple months each summer and all 8 0f the holding tank sensors were bad They had deposits on the ends like calcium and they trapped material between the probe and the nylon top covering. Even the top ones that were seldom in any liquid had build up. I use chemicals and flush after each use. 778334



- T21301VP
by:

I installed these probes last year to replace the originals (20 years old) and they work great! Installation was straight forward and they came with good instructions. 778176



- T21301VP
by:

Since replacing the sensors with the new Horst Probe I now can check the tanks and feel confident that the tank levels are correct and not worry about them over flowing. The best probe going. I highly recommend them for anyone with incorrect tank levels. 767439



- T21301VP
by:

easy to install, work good 707639



- T21301VP
by:

Easy to install. Grommet seals are perfect. Arrow indicator for correct insallation. 706637


Comments
Great
Brian S - 09/23/2020

100357

- T21301VP
by:

Fast shipping and Product is reasonably priced. Installed and work Great 700300



- T21301VP
by:

Excellent service/ fast delivery! Highly recommended! 694494



- T21301VP
by:

stop working after one month I'm not sure if there if its the senders or the gauge i will report back when i have time 683188



- T21301VP
by:

Bought to replace the level sensors in black water tank on my motorhome. Three worked great but one came apart when tightening and a portion of it fail inside of the tank. 681985



- T21301VP
by:

Easy install, works perfectly 680478



- T21301VP
by:

Working well after year in service 665392



- T21301VP
by:

No more false readings after one year of use on 23 trips with the RV 653948



- T21301VP
by:

Installed easily don't know how this will function over time but so far so good 650234



- T21301VP
by:

Had to replace my black tank last summer, so I thought that I would replace the factory probes with the new style valtara probes. They worked fine for about a month, then started showing partial full when tank was empty. Now the tank reads full all the time again. They just don't work right for me. 620098



- T21301VP
by:

The item came fast and was easy to inst all. 585108


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Ask the Experts about this Valterra RV Sewer

  • Why Would Blank Tank Full Sensors Give False Full Reading When Sensors are New
    When RV holding tank sensors incorrectly read full, it is typically due to residue. Since your trailer sat for a while it's very likely there is residue of some kind on the sensors. The best way to keep your tanks sensors working correctly is to take proper care of the tank itself. The waste tanks are more prone to sensor issues, simply because of the nature of the materials contained than fresh water tanks. What you need is a tank cleaner like the part # CAM41146 to break up everything...
    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...
  • 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...
  • How Many Sensors Does RV Have For RV Black Water Tank
    It should only have 4 sensors. That is the standard amount found on most RVs which is what the Horst Miracle Probe Sensors for RV Black Water Tanks # T21301VP is designed for.
    view full answer...
  • Replacing Black Water Tank Sensors
    You do not have to replace your sensors directly, but at the least you are going to want to install the Horst Miracle Probe Sensors # T21301VP next to your old sensors. They are positioned in a way that allows the reading to be as accurate as possible.
    view full answer...
  • Miracle Probe Sensors Work With Aladdin Black Water System
    The Horst Miracle Probe Sensors # T21301VP are universal so they will work with your Aladdin black water setup in your coach.
    view full answer...
  • Troubleshooting Valterra Horst Black Water Tank Sensors Read Empty All the Time
    Most likely a ground wire issue. There is one common ground wire between all tank sensor packs and frame. Quick test is to jumper between the bottom sensor and good ground, should read empty if tank is empty. Then you can jumper from the bottom sensor to the one above it for 1/3 and the one above that for 2/3 and the top one for full. If that works then check for the common ground wire. We have added ground wires in addition to the original one.
    view full answer...
  • Troubleshooting RV Water Level Sensor Not Showing Full
    You might have disturbed the wiring of the sensors when you cleaned them. When the sensor is grounded it will show the reading so if you ground your highest "full" sensor and it show that it's working that would mean you have a wiring issue with it.
    view full answer...
  • Do the Valterra Horst Miracle Probe Sensors Need to be Cleaned
    I spoke with my contact at Valterra regarding the Horst Miracle Probe Sensors # T21301VP referenced in your question. She stated that the probes do not require any kind of maintenance once installed and you will not need to clean them. Because the probes are surrounded by Teflon, they are not prone to liquid residue or debris buildup. She was not able to confirm an exact lifespan for the probes, however she did state that they are designed to last and there is no reason that they would...
    view full answer...
  • Compatibility of Valterra Black Water Tank Sensors with Existing System
    The Horst Miracle Probe Sensors for RV Black Water Tanks - Qty 4 # T21301VP will work with an exiting system where the sensor is installed on the top. The probes easily install into your RV black water tank's existing 3/8" diameter holes or you can also drill new holes next to the existing holes. These sensors have a Teflon sleeve surround to prevent build up and give you a more accurate reading.
    view full answer...
  • Black Tank Sensors fro Aluminum Holding Tank
    The Horst Miracle Probe RV Black Water Tank Sensors # T21301VP can be used on your aluminum holding tank since they have a rubber grommet that isolates the probe from the tank. When you tighten the first nut on the probe the grommet expands to provide a secure leak-proof seal at the hole. This allows the probe to work fine on aluminum as well as plastic holding tanks.
    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...
  • Troubleshooting Black Water Tank Sensors Giving False Readings
    We haven't received a lot of customer feedback regarding the Valterra Sensor Power Sensor Cleaner # V22011 that you referenced so I can't really provide an accurate success rate. The treatment is specifically designed to clean the sensors in an RV's black water tank to help correct those incorrect readings you keep getting but to be honest for how long you've been dealing with this issue along with the fact that you already tried cleaning them without success it might just be time to replace...
    view full answer...

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Info for this part was:

Expert Research:
Jameson C
Expert Research:
Adam R
Written by:
Amy B
Updated by:
Mary E

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