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.

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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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💧 Stay ahead of the tide with precision water sensing!

BULK PACK ADVANTAGE - 6-piece set means you’re always ready to maintain multiple tanks or backups.
SPACE SAVING SIDE MOUNT - Slim 8.8 cm length fits seamlessly on tank sides without clutter.
ROBUST ELECTRICAL RATINGS - Handles up to 10W power and 0.5A current for reliable performance.
DURABLE ALL WEATHER DESIGN - PP plastic body and float withstands wide temperature ranges (-10°C to 85°C).
PRECISION WATER LEVEL CONTROL - Ensure flawless aquarium balance with ultra-sensitive float switches.

The Anndason 6-piece black water level sensor set features compact, side-mount float switches made from durable polypropylene. Each sensor supports up to 100V DC switching voltage and operates reliably between -10°C and 85°C, making it ideal for aquarium tanks. With a slim 8.8 cm profile and a 40 cm cable, these sensors offer precise, hassle-free water level monitoring in a convenient bulk pack.

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Color	ブラック
Size	Style1
Manufacturer	Anndason
Material	プラスチック
Item Weight	5.3 Ounces
Product Dimensions	8.38 x 1.52 x 8.38 cm; 150.25 g
Package Weight	0.18 Kilograms
Batteries Required	No
Batteries Included	No

anndason 6ピースブラック水レベルセンサー水族館タンク側マウント水平液体フロートスイッチ

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