This is for an Infuser. This is the specific portafilter: https://www.amazon.com/gp/product/B0928XX5XF

They say it is stainless steel but it does not seem like it is stainless steel.

This is the one I bought: https://www.amazon.com/gp/product/B0928XX5XF

I think many sellers sell the same thing though.

Here is the link to the one I bought: https://www.amazon.com/gp/product/B0928XX5XF

They do not have it anymore. But I think many sellers sell the same one under different price points. You can guess that by the look.

This is the one: https://www.amazon.com/gp/product/B0928XX5XF

I think many different sellers sell the same thing.