Review on Absolute USA SPL2218R 22/18 Gauge Scotchlock Quick Splide Auto-TAP Connectors: Excelling in Secure and Fast Wire Connections by Lawrence Reuter

It's just a metal "plug" that shifts the insulation around the two wires that fit in and a plastic case so I do it do not see the need to buy more expensive ones. I haven't tested the connection with a continuity tester yet, but the connection looks solid. You can fill the cavity with silicone grease which can probably weatherproof it like these wire socket type knobs. .Squeezing with needle nose pliers requires some force. It is designed to be squeezed with regular or slip-joint pliers, which offer more mechanical advantages. The cap is only meant to be pushed down and prevent the metal connector from shorting to other metals. It's not for squeezing a metal fork.