Could this be tapped into an existing monitor system to act as a secondary monitor panel?

If you use the same sensors it will give you the same reading. If a sensor goes out, both systems will give you a false reading. If you want a secondary monitor get 4 more sensors then you would have a good secondary system.

all tanks are showing whatever the fresh water tank is reading. Might replacing this monitor fix that problem?

All is reading if there is problem for frish cheack sensore

Im confused. Does this come with the sensors to put onto/ into the tank? Or do i have to buy those separate?

It does not come with the sensors. It has the standard hook-ups that snap onto the sensor ends. My tank came with the sensors in it.

what sensors work best with this ?

Kib manufacturers the sensor packs. The probes aren’t super important.

Recpro Replacement Fresh Water Or Holding Tank Level Sensor Rv

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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427 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Romania.

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Description

🚐 Stay ahead on the road with smart tank monitoring that keeps you in control!

MULTI TANK MASTERY - Track fresh, gray, and black water levels effortlessly with intuitive LED indicators.
DUAL HEATER CONTROL - Manage both electric and gas water heaters directly from the panel.
SLEEK DISCREET DESIGN - Choose black or white to perfectly blend with your RV’s interior aesthetic.
SEAMLESS 12 V INTEGRATION - Plug-and-play with your RV’s electrical system for real-time monitoring.
DIY FRIENDLY INSTALLATION - Surface mount with included wiring harness—get set up in no time.

The RecPro RP-M21 is a compact, high-accuracy 12V DC monitor designed for RV enthusiasts who demand precise tracking of fresh, gray, and black water tanks plus battery voltage. Featuring easy-to-read LED indicators and controls for electric and gas water heaters, it offers a sleek black or white finish to match any interior. Lightweight and surface-mountable with included wiring harness, it’s the perfect upgrade for hassle-free, real-time tank management on the go.

Specifications

ASIN	B07XZJT5MJ
Best Sellers Rank	#3,028 in Kitchen ( See Top 100 in Kitchen ) #1 in Gas Heater Parts & Accessories
Brand	RecPro
Brand Name	RecPro
Customer Reviews	4.4 out of 5 stars 281 Reviews
Item Dimensions	13 x 73 x 118 millimeters
Item Weight	0.14 Kilograms
Item dimensions L x W x H	13 x 73 x 118 millimeters
Item weight	0.14 Kilograms
Manufacturer	RecPro
Material	High-Density Plastic
Material Type	High-Density Plastic
Maximum Supply Voltage	12 Volts (DC)
Maximum supply voltage	12 Volts (DC)
Measurement Accuracy	High
Measuring Range	3.75 - 3.75 inches
Model	RP-M21
Mounting Type	Surface Mount
Output Type	Analog
Part Number	RP-M21
Sensing Distance	3.75 Inches
Specific Uses For Product	Monitoring tanks in recreational vehicles, mobile living spaces, and outhouses
Style	Modern
Style Name	Modern
UPC	193652017509
Unit Count	1 Count
Upper Temperature Rating	60 Degrees Celsius

Reviews

B**R

جوده ممتازه

سعر جدا مناسب

10.01.2022

É**D

Aucun she shéma de branchement, donc il faut avoir une base en électricité

Très bon produit de remplacement!

1.06.2026

M**O

منتج غير واضح

للأسف لا يوجد دليل المستخدم ، و لا موقع المنتج في الأنترنت

28.02.2023

J**.

looks and works well

Looks identical to the old one mounted in my camper. I just swapped the boards. it was a little tight but I made it work and it looks and works well.

16.05.2026

P**L

Good Product

Seems like a good product

5.11.2023

E**E

Works great.

13.08.2025

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427 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Romania.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Pooja R.

The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

1 week ago

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RecPro Replacement Fresh Water or Holding Tank Level Sensor RV Monitor M21 Panel (Black)

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