While they *might* be useful, they are definitely not meant to be. Solder seal connectors are designed to work seamlessly, with the solder melting and the ends shrinking from the heat. The problem with this is that the solder NEVER melts and you will melt the insulation on the wire, the actual heat shrink tubing and whatever is underneath as it all liquefies and falls to the surface underneath. DO NOT buy them unless you are creatively punishing one of your employees who has to melt hot, runny plastic and copper water to convince them that they should get to work on time, sober and in the shower. If you have such use. And I'm making the jump here. then $10 for those crappy hookups really is probably the least of your problems.
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