Barista Basics Knockbox Open Bottom (6" x 6" x 5") rancilio-grinder-parts/rancilio-md40-grinder-whole The Viton seat holds calibration

The Viton seat holds calibration better under sustained heat than EPDM alternatives — if you're replacing a valve that's drifted from spec or won't hold pressure

The new diamond-shaped flange uses two mounting screws versus the old round flange — confirm your flange shape matches before ordering

Each unit is hand blown from borosilicate glass

100 count box

3-hole steam wand tip

Barista Basics Knockbox Open Bottom (6" x 6" x 5") rancilio-grinder-parts/rancilio-md40-grinder-whole The Viton seat holds calibrationBarista Basics Knockboxes are designed with quality and durability in mind. Unmatched by any other knockbox on the market, they are made with ultra strong ABS plastic and include a removable NBR rubber knock bar. Each unit is packaged with an oversized NBR rubber hush gasket for added resilience and noise reduction. The removable knock bar and sleek ABS design make these units easy to clean. The hush gasket for Barista Basics Knockbox has been