Amazon.com: BENFEI HDMI Coupler, HDMI Female to Female Adapter for Extending HDMI Devices - 2 Pack : Electronics
Amazon.com: Cmple - HDMI Female to HDMI Female Adapter Gold Plated, High Speed HDMI Coupler F/F Female to Female Adapter Cable Extender, 4K UHD and 3D Support - HDMI to HDMI Joiner
Mini HDMI® Female to HDMI® Male Adapter | Adapters and Couplers | Audio Video