A diamond pipe will do it if you configure it correctly.
This is actually good to know, since this is actually something I tried and it did not work, so I must have done something wrong.
The weird behavior I got out of the configuration as described was ALL the items went the alternate route, none got inserted even though the colour matched up and the fermenter had space. So I will have to tinker and figure out if if some element is causing a wierd behavior.