I disagree with reviewers who say these connectors are overpriced. They are not, for what they do. They provide a positive latching seal, and as important they seem to be completely waterproof. I imagine they could be totally immersed in water and would not leak. Both male and female connectors have a tight wide soft silicone seal at the back of the connectors. The mating side of the "positive" connector has a red O ring that seals into the "negative" connector when they are mated together. However there are no instructions, so it takes a bit of pondering to understand how they should be assembled. It is important to crimp them correctly, not so much to make a good connection (I would recommending soldering them after crimping) but so they will fit into their respective shells and allow the rear seal to be pushed in completely. After crimping and soldering be sure they are straight and the edges of the crimp do not protrude. Be sure to examine the female connector on your cable or solar panel and notice how far the metal is recessed in the shell. Yours should be about the same.Another hint to avoid getting + and mixed up when the stripped end of your cable is connected to the controller: Remember that your female connector that you will connect to the cable or solar panel male connector with the red O ring WILL BE HOT OR + END and the stripped end should be connected to the + side of the controller. The female that you attached to your wire is +. Your connector with the Red O ring will be negative, -. Clear as mud? Re-read this as you sit at your workbench until you puzzle them out.
One star knocked off for lack of documentation.
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