rsync multiple remote directories one connection

Hi,

I want to specify multiple remote directories but want to transfer them in a single command with one connection with remote server.

e.g.

rsync -vrt --size-only --delete user@host:/home/user1/dir1 user@host:/home/user1/dir2 user@host:/home/user1/dir3 .... local_dir/

I want to transfer dir1, dir2 and dir3 using the same connection. The above command will establish 3 connections. Is there way to achieve this?

thanks,
Sam