[CentOS] ssh and dd

Tonight I have to boot a diskless server with iLO and dd a remote image available by ssh
onto a usb key. As there is no local place to store the image, whats the most efficient
cmd to push the image from the remote server using ssh into the local pipe pushing out
to `dd of=/dev/sdx`?

Would a remote execution of `dd if=/dev/sdx` be the best over ssh? I suppose I could use
nc and do away with ssh, is that in the CentOS rescue mode?

Thanks,
jlc