The metal on these connectors is very thin and does not mate well with other manufacturers' connectors without some 'matching'. Using a small ratchet crimping tool, the insulation prevented a tight crimp. I found it necessary to carefully "finish" the crimp with the ViseGrips. Perhaps a manufacturer-supplied product would have worked better. Liked the heat shrinkability, but must be careful not to shrink the tubing around the joint areas themselves - the tubing makes it difficult to insert/remove the paddle, especially once the shrink material has shrunk on the mating face of the sleeve. Repairable. But annoying. Glue is good, seals well; Let's see how they behave over time. All in all a decent product for the price.