---
product_id: 30825311
title: "PRM 2-20 GPM Water Rotameter Flow Meter, 1 Inch Female NPT Connection, Acrylic Body with PVC End Tails, 316 SS Plunger & Travel Rod, Viton Seals, Max Pressure 85 PSI, Max Temp 125°F, ±4% Accuracy"
brand: "prm"
price: "€ 96.16"
currency: EUR
in_stock: true
reviews_count: 7
category: "Prm"
url: https://www.desertcart.de/products/30825311-prm-2-20-gpm-water-rotameter-flow-meter-1-inch
store_origin: DE
region: Germany
---

# UV-resistant acrylic body ±4% precision accuracy 316 SS corrosion-resistant plunger PRM 2-20 GPM Water Rotameter Flow Meter, 1 Inch Female NPT Connection, Acrylic Body with PVC End Tails, 316 SS Plunger & Travel Rod, Viton Seals, Max Pressure 85 PSI, Max Temp 125°F, ±4% Accuracy

**Brand:** prm
**Price:** € 96.16
**Availability:** ✅ In Stock

## Summary

> 💧 Flow with confidence, measure with precision — don’t let your system run blind!

## Quick Answers

- **What is this?** PRM 2-20 GPM Water Rotameter Flow Meter, 1 Inch Female NPT Connection, Acrylic Body with PVC End Tails, 316 SS Plunger & Travel Rod, Viton Seals, Max Pressure 85 PSI, Max Temp 125°F, ±4% Accuracy by prm
- **How much does it cost?** € 96.16 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/30825311-prm-2-20-gpm-water-rotameter-flow-meter-1-inch)

## Best For

- prm enthusiasts

## Why This Product

- Trusted prm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Integration:** 1-inch Female NPT connection fits seamlessly into standard water systems with up to 85 PSI and 125°F tolerance.
- • **Precision You Can Trust:** Achieve ±4% accuracy for flawless flow monitoring in critical systems.
- • **Chemical-Resistant Seals:** Viton O-rings protect against oils, chemicals, and weathering—perfect for harsh conditions.
- • **Engineered for Longevity:** 316 stainless steel plunger and travel rod resist corrosion and wear for long-term reliability.
- • **Built to Brave the Elements:** UV-resistant acrylic and PVC end tails ensure durability in outdoor and industrial environments.

## Overview

The PRM 2-20 GPM Water Rotameter Flow Meter delivers precise ±4% accuracy for water flow rates between 2 and 20 GPM. Its UV-resistant acrylic body combined with durable PVC end tails and corrosion-resistant 316 stainless steel components ensures robust performance in demanding environments. Equipped with Viton seals, it withstands chemicals and weathering, while the 1-inch Female NPT connection allows easy installation in standard water systems operating up to 85 PSI and 125°F.

## Description

The PRM 2-20 GPM Water Rotameter Flow Meter offers precise and reliable flow measurement for various water systems. Designed with 1 Inch Female NPT connections, this flow meter features an acrylic body with durable PVC end tails, making it lightweight yet sturdy. The 316 Stainless Steel plunger and travel rod ensure long-lasting performance even under moderate flow conditions. Equipped with Viton O-rings and seals, this meter provides excellent resistance to chemicals, oils, and other harsh environments. With ±4% accuracy, it delivers consistent readings, while the UV-resistant construction ensures durability in outdoor or high-light settings. Ideal for measuring water flow rates in systems requiring a flow range of 2-20 GPM.

Review: Monitors fluid flow well - Product works as it should.
Review: Works Great with my QT non pressurized flow center - Works Great with my QT non pressurized flow center. I used PVC also ( ToolmanJohn's design with a few changes ) but took a coupling and added to the end of the 90 where it would be pushed onto the QT return pipe. Chucked up the coupling in the lathe and flared it a bit to make it easier to find the QT return pipe. It reads the same as a borrowed unit that was over $400. This is a valuable tool to adjust the flow to the proper rate.

## Features

- Accurate Flow Measurement: Offers an accuracy of ±4%, providing precise readings for 2-20 GPM water flow, making it ideal for various fluid handling and monitoring systems.
- Durable Construction: The acrylic body with PVC end tails is UV-resistant and built to withstand external exposure, offering reliable performance even in harsh environments.
- Resistant Materials: Constructed with 316 Stainless Steel plunger and travel rod, the meter is engineered to resist wear and corrosion, ensuring longevity and accuracy in continuous use.
- Resistant Seals: Equipped with Viton O-rings and seals, which offer superior resistance to chemicals, oils, and weathering, making it suitable for industrial and outdoor settings.
- Versatile and Easy to Install: Featuring 1-inch Female NPT connections, it integrates seamlessly into most standard water systems and is designed for maximum pressure of 85 psi and max temperature of 125°F.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B017O8UXWK |
| Best Sellers Rank | #317,864 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #293 in Flowmeters |
| Date First Available | November 6, 2015 |
| Item model number | Z4004 |
| Manufacturer | PRM |

## Images

![PRM 2-20 GPM Water Rotameter Flow Meter, 1 Inch Female NPT Connection, Acrylic Body with PVC End Tails, 316 SS Plunger & Travel Rod, Viton Seals, Max Pressure 85 PSI, Max Temp 125°F, ±4% Accuracy - Image 1](https://m.media-amazon.com/images/I/51QBOf4keUL.jpg)

## Questions & Answers

**Q: Where are the FKM seals in this flow meter?**
A: There are PVC ends that attach to the acrylic body and the your piping would attach to the PVC ends. The seals are where the PVC ends meet the body of the rotameter.

**Q: What is the working psi rating for this device at 70f?**
A: Maximum pressure is 85 psi

**Q: What is the minimum length of lead in pipe required to maintain a flow profile at the specified worst case accuracy?**
A: It is good practice to approach the flowmeter inlet with as few elbows and restrictions as possible. The inlet piping should be as large as the connection to the flow meter. Length of inlet piping makes little difference for normal pressure fed flowmeters. Discharge piping should also be as large as the flowmeter connection and should not have an elbow or restriction immediately after the rotameter. For water flowmeters, water is generally incompressible and moderate back pressure will not affect the accuracy of the rotameter as calibrated.

**Q: is this suitable to be used to meter liquid fertilizers?**
A: Most likely no. These are calibrated to the specific gravity of water, (1.0) whereas the specific gravity of fertilizer would probably be around 1.5-1.8?  It would depend on the makeup of the fertilizer. We are a manufacturer, so if you knew the specific gravity of the fertilizer we could custom make rotameters and calibrate it to your specific gravity.

## Customer Reviews

### ⭐⭐⭐⭐ Monitors fluid flow well
*by P***E on May 27, 2024*

Product works as it should.

### ⭐⭐⭐⭐⭐ Works Great with my QT non pressurized flow center
*by D***D on July 19, 2016*

Works Great with my QT non pressurized flow center. I used PVC also ( ToolmanJohn's design with a few changes ) but took a coupling and added to the end of the 90 where it would be pushed onto the QT return pipe. Chucked up the coupling in the lathe and flared it a bit to make it easier to find the QT return pipe. It reads the same as a borrowed unit that was over $400. This is a valuable tool to adjust the flow to the proper rate.

### ⭐⭐⭐⭐ Can't be used vertical
*by H***D on January 25, 2021*

I bought this item to use in a geothermal heating system to measure the gpm. The description did not state that this item will only work in a horizontal set up. I wish the description would have been more clear. Cost me $10 in shipping to return. Looks like a good product if you need a horizontal set up.

## Frequently Bought Together

- PRM 2-20 GPM Water Rotameter Flow Meter, 1 Inch Female NPT Connection, Acrylic Body with PVC End Tails, 316 SS Plunger & Travel Rod, Viton Seals, Max Pressure 85 PSI, Max Temp 125°F, ±4% Accuracy
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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-03-02*