Scrap the FEP sheet from any debris in the VAT. The size is exactly the same as the original tank on the Duplicator 7. LARGE: 2mm opening, will hold large chunk of cured resin. Normal flow rate. SMALL: 1mm opening, catch everything. Low flow rate. Be carefull and slow. Once all the bed have been done, till it a bit and lift up the gunk. Rie in alcohol or water, doesn't matter. Repeat. Some model are not there, you can find more here: