What is the diameter of the white-colored ring? I need to know what size hole to drill.

The diameter of the threaded portion that is a part of the sensor is 16mm (<5/8"). The white soft plastic ring you refer to is 18mm diameter (<3/4"). The flange on that white plastic ring is 26mm (~1 1/8") diameter. Hope that helps.

What is the thread pitch on these?

I don't know the thread. It comes with its own nut.

Does this "Switch" contain physical contacts that open and close or is it some type of transistor?

This unit is an enclosed switch with two wires coming out. It can be installed to make/break contact in a fluid. I use it for water. When installed in one direction, it makes contact when full; when installed the other direction, it makes contact when empty. Thus, I have one switch at the top of a container collecting water to trigger when it is full; the other switch is at the bottom to trigger when it is empty.

Will these work under water?

Yes, that is how they work. In this installation the circuit is closed until the water is high enough to open it. As the water rises the float goes up, opening the circuit. When the circuit is closed, power goes to a 12Volt solenoid that allows water from an RO/DI unit to flow into the holding tank.

6 Pieces Black Water Level Sensor Aquarium Tank Side Mounted

Q: What is the thread pitch on these?

I don't know the thread. It comes with its own nut.

Q: Does this "Switch" contain physical contacts that open and close or is it some type of transistor?

This unit is an enclosed switch with two wires coming out. It can be installed to make/break contact in a fluid. I use it for water. When installed in one direction, it makes contact when full; when installed the other direction, it makes contact when empty. Thus, I have one switch at the top of a container collecting water to trigger when it is full; the other switch is at the bottom to trigger when it is empty.

Q: Will these work under water?

Yes, that is how they work. In this installation the circuit is closed until the water is high enough to open it. As the water rises the float goes up, opening the circuit. When the circuit is closed, power goes to a 12Volt solenoid that allows water from an RO/DI unit to flow into the holding tank.

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Description

💧 Stay ahead of the flow with smart, reliable water level sensing!

MULTI PACK CONVENIENCE - Includes 6 sensors to cover multiple tanks or backup replacements—never run dry on control.
VERSATILE COMPATIBILITY - Works seamlessly with Arduino and other microcontrollers for smart home or hydroponic setups.
DURABLE TEMPERATURE RANGE - Reliable performance from freezing cold to hot environments (-10°C to 85°C).
COMPACT LIGHTWEIGHT DESIGN - Sleek black float switch with a minimal 24g weight, perfect for discreet installation.
PRECISION LIQUID LEVEL DETECTION - Accurately senses water levels to automate your tank management.

This 6-piece set of black plastic float switches offers precise liquid level detection with a max switching voltage of 100V DC and current up to 0.5A. Designed for side mounting in aquarium or hydroponic tanks, each sensor operates reliably between -10°C and 85°C. Easily convertible between normally open and normally closed states, these compact sensors integrate effortlessly with Arduino and similar controllers for automated pump or alarm activation. Ideal for professionals seeking smart, scalable water management solutions.

Specifications

ASIN	B071ZG4Y34
Batteries Required?	No
Batteries included?	No
Colour	Black
Customer Reviews	4.5 4.5 out of 5 stars (208)
Date First Available	23 May 2017
Item Package Quantity	6
Item Weight	150 g
Item model number	43237-2
Manufacturer	Anndason
Material	Plastic
Measurement System	Inch
Part number	43237-2
Product Dimensions	8.38 x 1.52 x 8.38 cm; 150.25 g
Size	Style1
Style	Style1

Reviews

V**Z

un poco de tiempo para recibirlo pero dentro del tiempo prometido

Muy buenos, hasta el momento sin fallas

21.03.2023

C**N

Works great - if you use it correctly

24.02.2022

S**D

Floats my boat.

23.12.2025

G**3

So far, all of them work great

16.10.2022

M**.

Good and cheap

31.05.2022

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