---
product_id: 6581129
title: "McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch"
brand: "mcdonnell & miller"
price: "₱24892"
currency: PHP
in_stock: true
reviews_count: 8
url: https://www.desertcart.ph/products/6581129-mcdonnell-and-miller-fs4-3-general-purpose-liquid-flow-switch
store_origin: PH
region: Philippines
---

# Adjustable sensitivity 1" NPT 32°F to 300°F McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch

**Brand:** mcdonnell & miller
**Price:** ₱24892
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate Your Flow Control Game!

## Quick Answers

- **What is this?** McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch by mcdonnell & miller
- **How much does it cost?** ₱24892 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/6581129-mcdonnell-and-miller-fs4-3-general-purpose-liquid-flow-switch)

## Best For

- mcdonnell & miller enthusiasts

## Why This Product

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

## Key Features

- • **Durable Design:** Built to last with high-quality materials for reliable performance.
- • **Versatile Control:** Effortlessly manage your equipment with precision.
- • **Easy Flow Adjustment:** Fine-tune your flow settings with a simple sensitivity screw.
- • **Multiple Paddle Sizes:** Includes four stainless steel paddles for various applications.
- • **Temperature Resilience:** Handles extreme temperatures from 32°F to 300°F.

## Overview

The Mcdonnell & Miller FS4-3 General Purpose Liquid Flow Switch is engineered for seamless operation of electrically controlled devices, featuring a robust design that withstands a wide temperature range and offers adjustable sensitivity for optimal performance.

## Description

McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch

## Features

- For starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others
- 1" NPT
- Minimum/maximum temperature: 32 degrees F/300 degrees F
- Sensitivity adjusting screw makes flow adjustment easy
- Four stainless steel paddles included: 1", 2", 3" & 6" (25, 50, 80, & 150mm)

## Product Details

- **Operation Mode:** Automatic
- **Contact Type:** Normally Open
- **Connector Type:** Screw
- **Brand:** Mcdonnell & Miller
- **Terminal:** Screw
- **Item dimensions L x W x H:** 1 x 1 x 1 inches
- **Actuator Type:** Paddle
- **Contact Material:** Stainless Steel
- **International Protection Rating:** IP54
- **Number of Positions:** 2

## Images

![McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch - Image 1](https://m.media-amazon.com/images/I/717zPGpnXFL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ perfect fit
*by M***S on December 4, 2024*

good supply of paddles.

### ⭐⭐⭐⭐⭐ Original McDonnell & Miller product, Great quality.
*by L***N on January 21, 2013*

Used these for many years on commercial water heaters/ boilers. Last an average of 5-7 years. same as other well-known brands. Water in my district is very hard. Price is excellent.

### ⭐⭐⭐⭐⭐ Five Stars
*by P***S on May 26, 2017*

works great and saves me time!

## Frequently Bought Together

- McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch
- PIC Gauges TRI-RC-254R1.75-D Commercial Tridicator, Black Steel Case, Bronze Internals, Plastic Lens w/ Red Indicator, 2.5" Dial, 1.75" Stem Length, 0/75 psi Range, 1/4" Male NPT

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**Shop now:** [https://www.desertcart.ph/products/6581129-mcdonnell-and-miller-fs4-3-general-purpose-liquid-flow-switch](https://www.desertcart.ph/products/6581129-mcdonnell-and-miller-fs4-3-general-purpose-liquid-flow-switch)

---

*Product available on Desertcart Philippines*
*Store origin: PH*
*Last updated: 2026-03-05*