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.Customs & duties included in the price

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Description

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

DURABLE COMPACT BUILD - Crafted from resilient polypropylene with a sleek black finish, designed to fit discreetly on tank sides without intrusion.
ROBUST ELECTRICAL SPECS - Supports up to 100V DC and 0.5A switching current, perfect for low-power control circuits with relay integration.
BULK PACK FOR PRO EFFICIENCY - Includes 6 sensors to cover multiple tanks or backup needs—ideal for serious hobbyists and professional setups.
VERSATILE FLOAT SWITCH DESIGN - Easily switch between normally open and normally closed by simply inverting the float—customize your setup effortlessly.
PRECISION LIQUID LEVEL DETECTION - Accurately senses water levels to automate your aquarium or tank systems.

This 6-piece set of black side-mounted horizontal liquid float switches offers precise water level detection with a durable polypropylene build. Each sensor supports up to 10W contact rating and operates reliably between -10°C and 85°C. Designed for easy conversion between normally open and closed states, these compact 8.8cm sensors are perfect for automating pumps, alarms, or indicators in aquarium and tank systems. Ideal for professionals and enthusiasts seeking efficient, scalable water level management.

Specifications

ASIN	B071ZG4Y34
Best Sellers Rank	#221,974 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #121 in Liquid Level Sensors
Date First Available	May 24, 2017
Item Weight	5.3 ounces
Item model number	43237-2
Manufacturer	Anndason
Product Dimensions	3.3 x 0.6 x 3.3 inches

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6 Pieces Black Water Level Sensor Aquarium Tank Side Mounted Horizontal Liquid Float Switch

Description

Specifications

Common Questions