Save a Drop P3 Water Flow Meter – Fresh Water Fill Monitoring
As part of planning the fresh water system for this cargo trailer conversion, I wanted a simple way to
monitor how much water is going into the tanks during fills.
A small inline flow meter on the hose is an easy, low‑tech way to track gallons used and avoid overfilling.
One product I’m considering for this purpose is:
Save a Drop P3 Blue Water Flow Meter – Measure Gallon Usage from an Outdoor Garden Hose
Product Overview
The Save a Drop P3 is a compact, inline water flow meter that attaches to a standard garden hose.
It measures the total volume of water passing through and displays usage in gallons, making it useful for
filling RV or trailer fresh water tanks, portable containers, or even just tracking water consumption.
- Type: Inline water flow meter
- Connection: Standard garden hose
- Display: Digital readout of gallons used
- Use Case: Monitoring tank fills and conserving water
Why This Is Useful for the Build
When filling fresh water tanks, it’s easy to lose track of how much water has gone in—especially when filling from
portable containers or non‑metered sources.
A small flow meter like this provides:
- Overfill awareness: Know how many gallons have gone into the tank before it reaches capacity.
- Repeatable fills: Easy to track partial fills (e.g., “add 10 gallons” instead of “fill until it overflows”).
- Water usage insight: Helps understand how quickly water is consumed during trips.
- Portable and flexible: Can be used on any hose, not permanently installed.
How It Fits Into the Fresh Water Workflow
In practice, this meter would be attached inline on the hose used to fill the fresh water tank(s).
Before starting a fill, the meter can be reset to zero, and the display will show the total gallons added during that session.
- Attach meter between spigot and hose, or hose and tank fill.
- Reset meter before each fill.
- Monitor gallons as the tank fills to avoid overfilling.
- Optionally log usage to better understand daily water consumption.
This page serves as a reference for a simple, portable tool that can make tank filling more controlled and predictable,
especially when working with multiple tanks or off‑grid water sources.