Based on this product's specifications, here are some alternatives and similar models
Null Modem Cable OEM CABLE-138 9-pin female to 9-pin female, 1 m
Summary description:
Null modem cable OEM CABLE-138 is a 1 m serial crossover cable with 9-pin female (DB9) connectors at both ends. Designed to connect two RS-232 DTE devices directly for data transfer, configuration or diagnostics without a modem. Suitable for serial communication between PCs, industrial equipment, routers and legacy devices; offers straightforward plug-and-play use.