Amazon.com: zdyCGTime 4-PIN Mini-DIN S-Video Male to 2 BNC Female Y Splitter Extension Adapter Cable.Video Signal Transmission for Devices Such as oscilloscopes and Monitors (5ft/1.5M) : Electronics
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Cinch- Adapter - 50 Ohm BNC (F) to BNC (F) In Line Splice CPAD555 | eBay