On Tuttnauer models with serial numbers beginning with 93 and continuing to numbers beginning with 96 there is a brass disk on the rear of the machine.
This disk is held in place with (3) three 3mm Allen screws and holds the Filter Screen in place
Before removing these screws make sure the Chamber and Reservoir are empty of any water
On models with serial numbers beginning with 00, there is a Chrome cap at the rear of the autoclave
Behind this cap is a Filter Screen Before removing the cap make sure the Chamber and Reservoir are empty of any water
On units with serial numbers starting with 97 and continuing until 99 the only Filter was a plastic screen in the fill hole inside the Chamber