Allows two 75 ohm RG59 coax cables to be used together DO NOT USE with 2 single, 50 ohm, RG8X / RG58 coax cables. This will produce an impedance mis-match!
Coax cable "T" adapter, allows you to connect two pieces of coax together to a single connection. Commonly used for co-phase coax. Please note! You will have an impedance mis-match if you attempt to connect to 50 ohm CB coaxes together, if you want to create a co-phase coax system for CB you need to make sure both coaxes are 75 ohm, or RG59.