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, sleek water level sensing!

ROBUST ELECTRICAL SPECS - Supports up to 100V DC and 0.5A switching current for reliable performance
BULK PACK FOR SMART SCALING - 6 sensors included to outfit multiple tanks or projects at once
DURABLE POLYPROPYLENE BUILD - Resistant float ball and body materials ensure long-lasting use
PRECISION LIQUID LEVEL CONTROL - Accurately senses tank water levels for seamless automation
VERSATILE MOUNTING SWITCHING - Easily converts between normally open/closed by flipping the float

This 6-piece set of black horizontal liquid float switches offers precise water level detection for aquarium tanks and other liquid containers. Each sensor features a durable polypropylene float and body, supports up to 10W contact rating and 100V DC switching voltage, and operates reliably between -10°C and 85°C. Designed for easy conversion between normally open and closed states, these compact 8.8cm sensors come with 40cm cables, perfect for professional or hobbyist setups requiring scalable, dependable liquid level control.

Specifications

ASIN	B071ZG4Y34
Best Sellers Rank	#99,261 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #31 in Liquid Level Sensors
Date First Available	May 24, 2017
Is Discontinued By Manufacturer	No
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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