DLIO-BP is a blanking plate for use with the I/O expansion slots in MIDAS PRO3, PRO6, PRO9 and PRO X digital console control centres and DL351 and DL451 modular I/O stage boxes, and can be used to cover unused card slot positions. It shares the same front panel form factor as the DL441, DL442, DL443, DL444 and DL452 I/O cards.