I have bought the two connector lever nuts as well and these are great replacements for the typical wire nuts. They securely hold the wires and allow access to the circuit for testing without pulling the wires out of this connector. They are smaller than what they appear and I feel much more confident in the connection than what I did using wire nuts.  I have bought boxes of 50 for two sizes and love them<a data-hook="product-link-linked" class="a-link-normal" href="/Wago-222-413-LEVER-NUTS-3-Conductor-Compact-Connectors-50-PK/dp/B003K124UA/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Wago 222-413 LEVER-NUTS 3 Conductor Compact Connectors 50 PK</a><a data-hook="product-link-linked" class="a-link-normal" href="/Wago-222-413-LEVER-NUTS-3-Conductor-Compact-Connectors-50-PK/dp/B003K124UA/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Wago 222-413 LEVER-NUTS 3 Conductor Compact Connectors 50 PK</a>