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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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

💧 Stay ahead with smart water level sensing — never miss a drop!

DUAL MODE FLOAT SWITCH - Easily switch between normally open and normally closed by inverting the float
ROBUST ELECTRICAL SPECS - Supports up to 100V DC and 0.5A switching current for reliable control
BULK PACK FOR SMART MANAGERS - 6 sensors per pack to optimize multiple tanks or projects without hassle
DURABLE BUILD WITH P P MATERIAL - High-quality polypropylene float ball and body ensure long-lasting performance
PRECISION LIQUID LEVEL DETECTION - Accurately senses tank water levels for seamless automation

This 6-piece set of black horizontal liquid float switches by Anndason offers precise water level detection with a compact 8.8cm design. Rated for up to 10W and 100V DC, these durable polypropylene sensors operate reliably between -10°C and 85°C. Easily configurable between normally open and closed modes, they’re perfect for automating pumps, alarms, or indicators in aquarium tanks or other liquid containers.

Specifications

Brand	Anndason
Manufacturer	Anndason
Country of Origin	USA
Model number	43237-2
Colour	Black
Number of Memory Sticks	6
Item Weight	150 g
Product Dimensions	8.38 x 1.52 x 8.38 cm; 150.25 g
Item model number	43237-2
Item Height	3.3 Inches
Item Width	0.6 Inches
Are batteries included?	No

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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