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Product Information
Ensure a robust and weather-sealed connection for your lighting projects with the 4PIN M18 Transparent Waterproof Terminal Connector. This male and female plug set is engineered for durability and ease of use, featuring a secure screw-terminal block that eliminates the need for soldering. Its transparent housing allows for quick visual inspection of connections, while the M18 threaded locking ring creates a tight, waterproof seal perfect for outdoor or demanding environments.
Specifically designed for 4-conductor wires, this connector is the ideal solution for joining segments of RGB LED strips or other low-voltage AC/DC devices. Unlike pre-wired pigtails, this terminal block connector provides the flexibility to use your own custom-length wiring, making it a versatile choice for both professional installers and DIY enthusiasts seeking a reliable, field-serviceable connection. It is one of the essential 4-Pin RGB LED Strips Parts for any serious installation.
Key Features
IP68 Waterproof Rating
Provides complete protection against dust ingress and long-term water immersion, making it ideal for outdoor and marine use.
Secure Terminal Block
Features screw-down terminals for a reliable, solder-free connection, allowing for easy field installation and maintenance.
Transparent Housing
The clear PVC body enables instant visual confirmation of correct wire seating and polarity, preventing installation errors.
4-Pin Configuration
Perfectly matches the wiring requirements for standard 4-wire RGB LED strips and other multi-channel low-voltage applications.
M18 Locking Thread
A robust M18 threaded coupling ring ensures the male and female plugs lock together tightly for a secure, vibration-resistant fit.
Durable Materials
Constructed with high-conductivity copper contacts and a tough PVC insulator for reliable performance and longevity.
Technical Highlights
- Designed for High-Frequency AC/DC Circuits
- Robust Screw-Locking Mechanism
- Corrosion-Resistant Copper Contacts

Product Specifications
| Parameter | Details |
|---|---|
| Model | 4PIN-M18-WTC |
| Product Type | Waterproof Terminal Connector |
| Connector Size | M18 |
| Gender | Male + Female Pair |
| Pin Count | 4 |
| IP Rating | IP68 |
| Termination Style | Screw Terminal Block |
| Housing Material | Transparent PVC |
| Contact Material | Copper |
| Shape | Round |
| Total Length (Each Side) | Approx. 160 mm |
| Interface Type | AC/DC |
| Working Frequency | High Frequency |
Application Scenarios
How to Use This M18 Terminal Connector
- Ensure all power is disconnected before starting.
- Unscrew the rear cable gland nut from the connector housing.
- Strip approximately 5-7mm of insulation from the ends of your four conductor wires.
- Using a small screwdriver, loosen the four internal terminal screws.
- Insert each bare wire into its corresponding terminal slot. Observe the correct order for your application (e.g., +12V, G, R, B).
- Firmly tighten each terminal screw to secure the wire. Gently tug each wire to confirm a solid connection.
- Slide the cable gland nut back over the cable and tighten it onto the connector housing to create a waterproof seal.
- Repeat for the other connector half.
- To connect, align the male and female plugs and push them together, then tighten the M18 locking ring until snug.
- Verify the voltage and current ratings of your wiring are sufficient for your LED lights or device.
- Always double-check your wiring polarity and sequence before reconnecting power to prevent damage.
- Do not over-tighten the terminal screws, as this can damage the wire strands.
- For IP68 protection, ensure both the rear cable gland and the main locking ring are fully tightened.
What's in the Box
- ✓1 x 4-Pin M18 Waterproof Male Terminal Connector
- ✓1 x 4-Pin M18 Waterproof Female Terminal Connector
Frequently Asked Questions
Q: What is the main advantage of a terminal block connector over a standard pigtail?
A:A terminal block connector allows you to attach your own wires directly without soldering or splicing, offering greater flexibility in cable length and easier field repairs.
Q: Is this 4-pin connector compatible with RGB LED strips?
A:Yes, its 4-pin configuration is the industry standard for connecting 12V or 24V RGB LED strips, which have conductors for Red, Green, Blue, and a common positive.
Q: What does the 'M18' in the name signify?
A:M18 refers to the metric thread size of the connector's coupling nut, which is approximately 18mm in diameter. This ensures a secure, standardized fit.
Q: Can I use this connector for an underwater lighting project?
A:With its IP68 rating, this connector is designed to be submersible, making it suitable for underwater applications like pool or fountain lighting, provided all seals are properly tightened.
Q: What tools are required to install this connector?
A:You will need a wire stripper to prepare your cable and a small Phillips or flat-head screwdriver to tighten the internal terminal screws.
Q: Why is the transparent housing a useful feature?
A:The clear body allows you to visually inspect the wire connections after installation, confirming that each wire is fully seated and secured in the correct terminal.
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Downloads
Files for 4PIN-M18-WTCImages
These images were taken with Canon EOS 5D Mark IV and the studio light source is provided by Ra 98's full spectrum LED strip to realistically reproduce the colors of the item itself. All copyrights are created by the superlightingled team, please feel free to browse and download if you are a registered user!




LED Strip Lights Guide
Here you can learn anything about LED strip lights — pick the topic you are interested in to go deeper. We cover LED strip lights, power supplies, controllers, accessories, and how to connect LED strip lights. You can also watch our demo videos.
Led strip lights
►Everything you need to know before you buying led strip lights
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►COB led strip light
| 1. What is COB? 2. What is the COB production process? 3. Different types of COB strip lights 4. What is the difference between COB and SMD led strip lights? 5. What is the difference between COB and LED? 6. Are COB led strips better? 7. How to cut and connect COB led strips? 8. How to install COB led strip lights? 9. Can COB light strips use aluminum channels? 10. Why choose superlightingled? |
►Led neon lights
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►Addressable led strip
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►Color, color temperature, and CRI
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Led strip light connection
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Controller for led strip lights
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Led power supply
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Led strip light installlation
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Accessories
| How to choose led strip light connectors? 1. Are all LED light strip connectors the same? 2. How do LED strip lights connectors work? 3. What connectors do you need for LED strip lights? 4. What are the different kinds of LED connectors? 5. How to choose the right connector for your led strip lights? Ultimate Guide on Aluminum Profile for LED Strip Lighting 1. What are aluminium profiles used for? 2. Why choose aluminum profiles? 3. Different types of LED aluminum profiles 4. LED aluminum profile VS COB LED strips 5. How to install LED aluminum channels? 6. How To Get Ideal Light Diffuser For Your LED Strip? 7. Add Black Aluminum LED Light Diffusers For Your Home Lighting 8. How To Find The Right Aluminum LED Light Strip Diffuser Channel? |





