Whether you’re integrating sensors on a marine buoy, upgrading outdoor LED displays, or simply wiring up a garden pond pump, one thing is certain: water and electricity don’t mix. That’s where waterproof connectors earn their keep. But when you glance at a datasheet and see “IP67” on one option and “IP68” on another, the distinction can feel blurry. Both sound impressively sealed. Both promise protection against the elements. So which one actually fits your project?

In this guide, we’ll walk you through what IP67 and IP68 really mean, where each rating excels, and how to make a confident choice—whether you’re a procurement engineer specifying thousands of units or a hobbyist building something that simply has to last outdoors.

Understanding IP Ratings: A Quick Primer
Before we compare numbers, it helps to know what we’re measuring. An IP (Ingress Protection) rating, defined by IEC 60529, tells you how well an enclosure resists solid particles and liquids. The first digit covers dust (6 means completely dust-tight), while the second digit covers water.
Both IP67 and IP68 connectors start with a “6,” so they’re equally impervious to dust. The real story lies in that second digit—and in the test conditions manufacturers choose.
IP67 means the connector can be submerged in 1 meter of water for 30 minutes without harmful ingress. This is a standardized, repeatable lab test.
IP68 means the connector surpasses IP67, but the exact conditions—depth and duration—are defined by the manufacturer. One IP68 connector might be tested at 2 meters for an hour; another could handle 10 meters for 24 hours. There’s no universal benchmark.
That single fact is the most important thing to carry forward: IP68 isn’t simply “better” in a vacuum. It’s a promise that must be read in the fine print.

An IP67 waterproof connector is designed to survive the kind of drenching you’d expect outdoors—a heavy downpour, a brief dip into a puddle, a washdown with a low-pressure hose. Once the water recedes, the connector stays dry inside.
An IP68 waterproof connector goes a step further. It’s built for sustained submersion under conditions the manufacturer explicitly states. This could mean sitting at the bottom of a water tank, sealing underwater cameras, or surviving the constant pressure on a ship’s hull. If your application keeps the connector permanently wet, IP67 simply isn’t rated for that job.

Real-World Application Scenarios
To make this tangible, let’s look at where each rating naturally fits.
When IP67 Is the Right Choice
Outdoor LED lighting and signage: Connectors face rain, snow, and occasional puddles but aren’t continuously underwater.
Agricultural sensors and irrigation controllers: Buried junction boxes can flood temporarily after heavy rain; IP67 keeps them operational.
Automotive and RV auxiliary connections: Under-hood harnesses, trailer plugs, and exterior cameras encounter splashes and road spray.
Portable industrial equipment: Tools and portable instruments used outdoors that might be dropped in water briefly.
Consumer electronics: Garden pumps, camping gear, and outdoor speakers that can shrug off a storm.
For all these situations, IP67 waterproof connectors strike the perfect balance between reliable environmental sealing and cost-effectiveness. You get genuine water protection without over-engineering the solution.
When IP68 Is Non-Negotiable
Marine and underwater equipment: Bilge pumps, sonar transducers, underwater drones, and submerged junction boxes.
Water treatment and wastewater plants: Connectors may sit in wet wells or be subjected to high-pressure cleaning jets on a daily basis.
Geotechnical and hydrological instruments: Piezometers and level sensors permanently installed below the water table.
Food and beverage processing: Equipment that undergoes rigorous washdowns at high temperature and pressure, often paired with specific chemical resistance requirements.
Offshore and renewable energy: Subsea connectors on tidal turbines or oil platforms that must survive at significant depths for years.
Here, specifying an IP68 waterproof connector isn’t about playing it safe—it’s about meeting the fundamental demands of the operating environment. The cost of failure at 5 meters underwater is orders of magnitude higher than the difference in connector price.

Key Factors to Consider When Choosing
Before you default to “higher is better,” run through this checklist. It will save you money and prevent unnecessary bulk or complexity.
1. Actual Water Exposure
Ask yourself honestly: will this connector be submerged, and if so, for how long and how deep? A temporary flash flood scenario calls for IP67. A permanent installation in a fountain calls for IP68 with clearly stated depth and time parameters.
2. Manufacturer’s Test Specifications for IP68
This is the step that separates a well-informed buyer from a guesswork-prone one. Always check the datasheet. One IP68 connector might carry a specification of “2 m / 24 h,” another “10 m / 500 h.” If the manufacturer doesn’t publish these details, ask. A vague “IP68” stamp alone doesn’t tell you enough.
3. Mated vs. Unmated Sealing
Does the connector need to be waterproof only when fully plugged in, or also when disconnected and capped? Many IP67 and IP68 connectors achieve their rating only when mated. If your application involves frequent disconnection in wet areas, you may need additional protective caps or a different sealing design.
4. Cable and Assembly Integrity
A waterproof connector is only as strong as the cable it attaches to. The cable’s outer jacket must seal properly with the connector’s gland or overmold. If you’re assembling in the field, pay close attention to recommended cable diameters and torque values. A correctly specified IP68 connector assembled incorrectly will still leak.
5. Temperature and Chemical Exposure
Water depth isn’t everything. Hot water, steam, cleaning agents, or UV exposure can degrade seals over time. If your “water” is a chemical solution, verify material compatibility. Some connector lines offer silicone or EPDM seals rated for a wide temperature range and specific chemical resilience—factors that matter as much as the IP digit.
6. Budget and Availability
IP68 connectors generally cost more due to tighter tolerances, specialized gaskets, and rigorous individual testing. If IP67 meets your needs, you’re likely to find a broader range of cost-effective, readily available options in common shell sizes and contact arrangements. In volume purchasing, this difference adds up fast.

Finding the Connector That Fits Your Build
At the end of the day, selecting between IP67 and IP68 waterproof connectors isn’t about chasing the highest number. It’s about matching the connector’s real-world tested capability to the actual demands of your environment. For most outdoor equipment that sees rain, snow, and the occasional accidental dip, a quality IP67 connector delivers years of trouble-free service without the extra cost or size of an unnecessarily deep-water-rated solution. When true continuous submersion enters the equation, a properly specified IP68 connector becomes essential—and the key is reading beyond the label to the depth and duration it was actually verified for.
We engineer a wide portfolio of circular waterproof connectors in both IP67 and IP68 configurations, with transparent test documentation so you can specify with confidence. Whether you need standard M12 field-wireables for an industrial sensor network or custom overmolded assemblies for a next-generation marine instrument, we’re here to help you make the right call.
Ready to choose with clarity?
Browse our selection of IP67 and IP68 waterproof connectors, or reach out to our engineering support team with your submersion requirements. We’ll help you find the exact match—no overkill, no compromise.