BNC T Adapter - 1 Female to 2 Females | Computer Cable Store
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BNC T Connector | Coax Connectors & CCTV Accessories
BNC T Connector - plug 1 camera into 2 monitors or recorders
BNC T Connector 1 Male to 2 BNC Male Coaxial Cable CCTV Video Splitter Adapter | eBay
BNC T-connector, male to female
Amazon.com: BNC T Adapter Male to 2 Female Connector Splitter (10/20/30/50/100 Pack) (30) : Electronics