PL-258 splicing connectors have two SO-239 sockets back-to-back. Each accepts a PL-259 plug two join two sections of coax cable together.
The revolutionary Centerpin PL-258-CP-G gold-plated connector is a solderless, easy to make splice that goes on without a hitch. It makes just as good, or better, connections as traditional solde connectors, both to the coax braid and to the center conductor.

For either RG-58/AU or RG-8/X coax
NO stripping and shaping insulation
NO soldering
NO heat
NO tinning the braid
Gold-plated brass construction for trouble-free connections in corrosive environments