Valterra T21301VP Horst Miracle Probe - Black Water Tanks, Pack of 4

These are the best sensors, I have been able to find for use on our camper grey tanks.They are accurate and easy to install.While you’re replacing the sensors, I would also recommend replacing the sensor harness at the same time.The factory sensors never read correctly, these read accurately and have not given me any false readings. If I have any issues in the future, I will come back and edit this review but don’t expect to have any problems with these new sensors, they have good reviews.

I love these Valterra T21301VP Horst Miracle Probes. They worked great! My black tank readings were accurate all summer long; the sensors never lied. They were easy to install and they don't leak. I wish I had found these probes earlier so I wouldn't have had to guess about my black tank levels.

Three probes worked perfectly. One probe in the package of 4 did not work. Once the nonfunctioning probe was identified and replaced with a different probe then all of our RV black tank readings functioned. We've learned from our mechanic son to never assume that the parts you receive work correctly.

My original sensors were sending false signals the tank was full; soon as I install these sensors tank the signal was empty as appropriateThe real test is to come on my next camping venture. If I have any problems I'll update my rating, this is as of 5/22/24.

nice product

Got tired of false reading on black water tank and gave these a shot. I disconnected the old ones and left them there and drilled new holes next to the old and I stalled these. Had RV out for a week with 7 of us and didn't have any issues with not saying "E" once I emptied it

Installed these and they worked for about 1 month. Now they always read full. Horrible product. Do not buy. Can't return after it's been soaking in feces. . . .

My OEM probes in my Thor Sequence were terrible. They were so inaccurate they might as well not even been there. I was constantly cleaning the tank, trying to get some sort of consistent/accurate measurement, but it was all a waste of time. These Horst probes completely solved my problem. I’ve been on several trips now & they have functioned perfectly (both the black & grey water tanks).

Got this tank sensor pack to replace some old ones on our trailer. Drilled new holes to install in the grey tank and also installed new wire couplings for each sensor. I had hoped to reuse the existing wiring couplings but they were too rusted. Put on a dan of silicone on the nuts so they would not shake loose. The tank filled and the sensors showed accurate readings. Took around an hour to install. Very happy with these. Hope they last and keep performing well!

Facile à poser. Et depuis mon niveau d'eau grise fonctionne. Je recommande.

My original sensors were starting to have problems so I decided to go with these due to many good reviews. I watched a few videos to ensure that I was removing the old sensors correctly and how to install the new ones. In my case they fit directly into the same holes that the old sensors used. I was also fortunate that the RV had an access door for the valves and bottoms of the tanks so it was easy to get to the sensors. I replaced them late in the summer and they worked as expected.

Easy replacement of existing sensors

Easy to replace and fixed our misreading sensors on our black tank.