Ascaso Bar Steam/water Valve Knob la-marzocco-strada-mp/strada-mp-fittings-and-valves-2 and the PTFE ball seal

and the PTFE ball seal housed inside the nut

Fits: Rancilio Stile grinder (Stile hopper only — not interchangeable with other Rancilio hoppers)

or static/clumping getting worse even after a clean

and exceptional coffee

This is a common wear point on E61 groups in hard-water areas -- scale buildup inside the diffuser can cause a weak or chattering exhaust between shots

Ascaso Bar Steam/water Valve Knob la-marzocco-strada-mp/strada-mp-fittings-and-valves-2 and the PTFE ball sealAscaso Bar Steam Water Valve Knob Body Flared plastic valve knob with a brass, 1 mm thread pitch twist insert, used on the steam and water valves across every Ascaso Bar and Barista variant. This listing is the knob body only. COMPATIBILITY Fits: Ascaso Bar and Barista models (all variations) Works with: requires a separate washer, split pin, and either the steam or water cap insert INSTALLATION Hand tight assembly onto the valve stem no tools needed.