At first we had only the good Feeder Type A01044 ordered: Bird Feeder and later bought later this drip tray for us Among screws. So the uneaten food are collected that would otherwise fall to the ground and there undesirable grow (eg cress carpet ;-) etc.), saving feed and prevents rapid development of mold on the wet grass as the drip tray has water drainage holes. Does not fit you according to the product description for each Gardman feeding column, so check beforehand times after the type number, so that the shell ("slice") is compatible. The screw has also fit the bill perfectly. The birds also like to sit down by the way to the bowl and pick from there.