Belkin 2-Position DB25 Universal Manual Box Switch with 2 DB25 F IN/1 DB25 F OUT Serial DB-25 switches feature DB-25 female ports All 25 lines are transferred and may be used in parallel applications with IBM PCs Centronics parallel manual data switches feature 36-position Centronics female connectors on all ports Manual data switches are not recommended with use of laser printers Lifetime warranty included