D-sub DB9 Breakout Board Connector with Case 9 Pin 2 Row Female RS232 Serial Port Solderless Terminal Block Adapter with Positioning Nuts Connectors - Newegg.com
Amazon.com: BUELEC DB9 Female and Male Connector in One Breakout Board,RS232/RS485/CAN/RS422 with DB9 Connector to Terminal Board Signal Module(2pcsDB9 Female/Male) : Electronics
RS232 Breakout Box
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RS232 DB9 9P Male to Female Head Serial Port w Jumper Wire 26cm Long - Walmart.com