Here’s one step up. I got these from Harbor Freight (harborfreight.com), and they do a great job of keeping dirt out of the connection. Instead of that hard plastic shell of the connector in the previous photo, this one is wrapped with a heat-shrink kind of material. They are still color-coded, but the colored-plastic covering shrinks. I use a butane lighter to shrink them, but a heat gun is better. If you do any of the connecting steps wrong, they likely won’t be waterproof anymore.