McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch
Item #: 402234

McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch

Item #: 402234

ZAR 4707

ZAR 5060

Price Details

Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )

*All items will import from US

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us Imported from USA store

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Order now and get it around Tuesday, December 01
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Note: Step Down Voltage Transformer required for using electronics products of US store (110 V-120 V). Recommended power converters Buy Now.

What Stands Out

Reliable Performance
Ensures consistent operation by accurately detecting liquid flow rates, preventing potential system failures and maintaining efficient process control across various applications.
Versatile Compatibility
Designed to work seamlessly with multiple liquids, making it suitable for diverse industrial applications while reducing the need for various switches.
Durable Construction
Built with high-quality materials that withstand tough environments, providing long-lasting durability and reducing maintenance costs over time.

Product Details

Get the McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch at Ubuy South Africa. Perfect for electrically operated equipment. Shop now!
Package Weight2.16 Pound

Who Should Buy?

Suitable For
  • HVAC Systems

    Ideal for HVAC professionals needing reliable flow detection to optimize system performance and prevent equipment damage.

  • Industrial Applications

    Well-suited for various industrial processes where liquid flow monitoring is crucial for operational efficiency and safety.

  • Water Treatment

    Effective for water treatment facilities requiring precise flow measurement to ensure proper chemical dosing and system integrity.

Not Suitable For
  • High Viscosity Fluids

    Not suitable for fluids with high viscosity that could impede the functionality of the flow switch.

Product Description

McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch

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Customer Questions & Answers

  • Question: How to Shop McDonnell & Miller FS4-3 General Purpose Liquid Flow Online From Ubuy?

    Answer: It’s easy to shop McDonnell & Miller FS4-3 General Purpose Liquid Flow online from Ubuy. You just have to search for the product, choose your shipping method while checking out and get it delivered to your location.
  • Question: Is McDonnell & Miller FS4-3 General Purpose Liquid Flow Available to Shop Online in South Africa?

    Answer: Yes, at Ubuy South Africa this product is available for you to shop at a reasonable price. The McDonnell & Miller FS4-3 General Purpose Liquid Flow is not available locally but you can trust us with our express shipping services.
  • Question: How Long Does It Take to Get Product After Placing the Order?

    Answer: The delivery time of your ordered product varies as per what you've ordered and the shipping method that you've chosen. The estimated delivery time is mentioned during the checkout process, so be carefree while shopping.

Mcdonnell & Miller Flow Switches Editorial Review

The 3/4" Water Flow Switch is an essential component that has become popular among commercial water heaters and boilers. The switch is quite sensitive, so it should be installed at a distance of 1/2" to 1" from the bottom of the water flow. When installed correctly, it works great and saves time. The product is highly efficient, with a 120VAC switch rating of 7.4 Full Load Amps and 240VAC is 3.7 Full Load Amp. The pricing is competitive, and the switch has a long lifespan of 5-7 years, especially in areas with very hard water.

Customer Reviews & Ratings

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Pros

  • Highly efficient
  • Good value for money
  • Easy to install
  • Works great when installed correctly

Cons

  • Sensitive, and can trip if not installed at the correct distance from the bottom of the water flow.

Platform Trust & Buyer Confidence

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4.3/5 225 reviews
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Danielle
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“Best service received. They assisted me with my purchase online via whatsapp every step of the way. They were prompt and efficient , thank you. My daughter is very happy with her douglas dog.”

14 October 2026 · via Trustpilot
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Devin
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“Fast delivery service,great condiotion of package”

14 October 2026 · via Trustpilot
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Dylan
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“Delivered ahead of schedule. Ubuy checkout system and customs process was super easy, will definitley use them again.”

23 October 2026 · via Trustpilot
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Leela
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“Always sceptical of overseas shipping…pleasantly surprised Always sceptical of overseas shipping to SA. It was fast and communication was clear the whole process”

27 October 2026 · via Trustpilot
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Douglas
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“Quick and easy, from order to delivery, package came with DHL quicker than expected. We are loving the Garmin Pro e-collar, we don't use it for bark control, just training, and for our GSP with high energy, it has changed our lives in how he listens to commands now.”

31 October 2026 · via Trustpilot

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