Amazon.com: Cable Extension Coupler, with Washer and Nut - 4 Pack - Works with Wall Plates - Connects Two Coaxial Video Cables, for Coax F81 (Female to Female) 75 Ohm, 2.3Mhz-3GHz Satellite, CATV : Electronics
SIEMENS 6GK57988MC000AM1 Conduit and Cable Clamp Washers | WESCO