Set of 2 plastic keys for MC4 connectors (not for MC4 EVO 2 connectors).
To create a watertight and durable connection between your solar panels, it's crucial that your MC4 connectors are properly tightened. Tightening with pliers won't achieve the desired result, as you could damage the connectors. Furthermore, you won't know when the connectors are sufficiently tightened or overtightened.
(Photos for illustration purposes only, can also be supplied in blue)