Converted my $10 Breville 2 cup 54mm double wall (pressurized) filter to single wall (non pressurized) filter since everywhere was out of stock or $50+. Now I just need to test it
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Breville Two Cup Dual Wall Filter, 50mm SP0000166 21614201294 | eBay
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New GENUINE SEALED BREVILLE 54mm 2 CUP DUAL WALL FILTER - BES840XL, 860XL, 870XL | eBay