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Espresso Knock Box With 1/2 in PVC Bar
A 96 x 84 x 84 mm espresso knock box for dumping used pucks from 51–58 mm portafilters. The knock bar is a 96 mm offcut of 1/2 in schedule 40 PVC pipe (21.3 mm OD). It slides through 21.9 mm teardrop bores in thick side bosses, so you can pull it out to wash the bin or swap in a new bar.
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