How do I know how many tanks my RV has?

Most RVs have 3 tanks: fresh water, gray (sinks/shower), and black (toilet). Smaller trailers and pop-ups often have just 2 tanks (fresh and black). Fifth wheels and luxury motorhomes may have 4 tanks, adding a separate galley/kitchen tank. Check your owner's manual or look under your RV to count tanks.

Will the SeeLeveL II work with my RV?

SeeLeveL II works with most RVs that have plastic or polyethylene holding tanks. It is not compatible with metal or fiberglass tanks. The external sensors mount using 3M adhesive—no drilling required.

Do I need to remove my old tank sensors?

No. SeeLeveL II mounts on the outside of your tanks and can reuse your existing wiring. Your old internal probes can remain in place.

Find Your SeeLeveL II in 60 Seconds

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How many tanks does your RV have?

Count your holding tanks: fresh water, gray, black, and galley (if equipped).

2 Tanks

Fresh + Black
Pop-ups & small trailers

3 Tanks

Fresh + Gray + Black
Most common setup

4 Tanks

+ Galley/Kitchen
Fifth wheels & luxury RVs

Any extra features you need?

Toggle on any features you want. Skip if you just need basic tank monitoring.

Water Pump Switch

Control your pump from the monitor panel

Bluetooth

Check tank levels on your phone

RV-C / NMEA 2000

Integrate with your coach's network

LPG / Propane Level

Monitor propane with existing sensor

Your Perfect Match

Based on your 3-tank setup:

Why RVers Choose SeeLeveL II

✓ Actually Accurate

0-100% digital readings instead of vague 1/3, 2/3 marks. Know exactly what you have.

✓ No False Readings

External sensors can't get fouled by buildup like internal probes do.

✓ Zero Maintenance

No probes to clean or replace. Install once and forget it.

✓ Easy Install

Uses existing wiring. 3M adhesive mounting—no drilling tanks.

View All SeeLeveL II Models - or - View Comparison Guide

Find Your SeeLeveL II Tank Monitor