This T adapter would generally allow you to plug two BNC cables on to the adapter, and then plug the adapter into 1 BNC source. Reviews
Quick view BNC Adapter, 90 degree angle BNC Male/Female 90 degree Angled Adapter Our Part No.: 270217
Quick view BNC Female To RCA Plug Adapter This will take your standard BNC cable end and turn it into an RCA male cable. Our Part No.: 270204
Quick view BNC Male To RCA Female Adapter Perfect for making your RCA cable into a BNC Cable Our Part No.: 270205