Hopper Ducts

Hopper Ducts is a mod by FyberOptic based around variations of the Vanilla Hopper. It adds two new variations of the Hopper, the Grated Hopper, and the Hopper Duct. The Grated Hopper is a version of the Hopper that allows for item filtering/sorting. The Hopper Duct is the main part of the mod, which acts similar to a standard pipe.

Hopper Duct
The Hopper Duct is a block from the Hopper Ducts mod. The Hopper Duct is a variation of the Vanilla Hopper. The key differences are that it can send items to the inventory above it, it only has 1 inventory slot, it will not pull items from the inventory above it, it auto-orients itself to other Hoppers and Ducts, and it can be oriented with a stick. Using a stick on the Hopper Duct will cycle through the possible directions, while hitting it with a stick will do that in reverse. You can tell which direction it is facing by the small grey pipe.

Grated Hopper
The Grated Hopper is a block from the Hopper Ducts mod. This is a variation of the Vanilla Hopper, only it has a filter inventory. Items that are in the filter inventory (bottom in the GUI) are the only items that pass through it that can reach the final destination. The final destination is the side that appears connected to an inventory, like the Vanilla Hopper. Items that do not match the filter can still be passed into the Grated Hopper. These items must be outputted through the bottom. A hopper below it cannot get items from the Grated Hopper that match the filter inventory.