Convert from 300 ohm terminal type connections to 75 ohm "F" style cable. Used to connect cable to older TVs and VCRs. 1 Per Card. Prime Products was established in the early eighties to supply the RV after market with a wide variety of accessory items. Our roots in the RV industry date back to 1964. We have used our experience and knowledge of this unique market to deliver a broad range of accessory items to the RV enthusiast.