HARIO Upper Bowl for Coffee Syphon TCA-3

A cracked or missing upper bowl shouldn’t mean the end of your favourite brewing ritual. The HARIO Upper Bowl for the Technica TCA-3 is a factory-spec replacement part designed to return your syphon to full working order — preserving the precise volume, shape and thermal behaviour that make vacuum brewing predictable and repeatable. Made from HARIO’s signature borosilicate glass, the upper chamber tolerates rapid temperature changes during the rise and draw-down phases while remaining chemically inert so flavour stays pure.

Compatibility and fit matter in vacuum brewing, where small changes in headspace or tube depth alter pressure dynamics and extraction. The BU-TCA-3 is manufactured to the exact dimensions of the original Technica 3-cup upper bowl so your existing filters, gaskets and recipes will perform as intended — no adaptation required. This makes the replacement ideal for home baristas who rely on established ratios and roasters or cafés that use the Technica regularly for demonstrations or small-batch filter service.

Functionally, the upper bowl plays a key role in syphon brewing: it houses the filter, holds the coffee bed, and governs the moment and manner in which the infused liquid returns to the lower chamber. HARIO’s smooth, spherical interior promotes even convection and extraction as water rises into the upper chamber, and the exact wall thickness and tapering on the BU-TCA-3 help maintain the classic Technica draw-down timing. Replacing a compromised bowl with this OEM part restores that behaviour and preserves cup clarity and sweetness that syphon brewing is prized for.

Durability and care are practical considerations. Borosilicate glass resists thermal shock far better than ordinary glass, and HARIO manufactures these parts with strict quality controls to reduce surface flaws that cause premature failure. The upper bowl is straightforward to clean — it’s dishwasher safe according to HARIO guidance, though hand washing will extend the life of silicone seals and metal parts — and it’s compact to store when you keep a spare on hand for busy service or demonstrations. For those who use a syphon frequently, having an OEM spare reduces downtime and avoids the fit problems and safety risks that come with generic substitutions.