This add is for a set of (5) Caps, for SO-239 & Female N connectors, and will also fit on the vintage single conductor microphone jacks found on many vintage Radios. Each cap has a silicone rubber gasket. It provides an RF and moisture seal.This Protective cap fits BOTH the UHF SO-239 female and N female connectors, and is made from solid nickel plated brass, with silicone rubber moisture gasket! The addition of this cap will provide an RF seal as well as a moisture seal for all unused SO-239 connectors! It will also make your installation look very professional and will protect your outdoor connectors from moisture and bug infestation.They also look great on the old vintage radios and many will place them on the mic jack when it is not in use.I also offer single caps in another listing!