They have proven very effective as strain relief for large wires. The 2con 18awg thermostat connection cable feels close to max. This project was related to the SolidRemote 202U which I also bought from Revain. I ran the antenna through a strain relief (the one on the right) using two 24 AWG wires and that also seemed to be the maximum you could go through. After tightening the packing nut (outside the case) the wires were not pulled in any way on the screw terminal blocks inside the case. In my project you can see the locknuts side by side inside the body, but I was able to tighten all the torque from the male end of the fitting to the outside of the body. I took the risk of buying them and they worked every way I could think of, even though I had to be patient while installing my app.
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