So I have a MFR farm set with pipe's taking seeds from the harvester's chest and putting them back into the planter's while an ME precision import bus taking the crop's and a ME level emitter turning the harvester's off as needed. However even with all of this the system is not 100% automated, I need a way to pull excess seeds out of the planter's for deletion (I was going to use Extra Utilities Trash Can block) while leaving a certain amount (like say half a stack) so that the planter's can do their job, otherwise the seed's will just back up in to the chest filling it and preventing the crop's from reaching the ME network. Anyone know of a pipe/block that can fill this role?