I installed most of these with just nuts and they looked fine. I recently had to replace an outlet and required push wires due to limited wall/box space. Three separate outlets (all from this order) caused wiring problems (open neutral, reverse ground/hot, etc.) on other outlets downstream. It turned out that the bottom hot plug of EACH socket was broken. Everyone. Swapping them on the push connector with the top pins got my voltage and circuitry working again. A manufacturing defect and when it comes to electricity you don't want to buy from a company that supplies defective sockets!
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