Water/steam tap knob walnut

What is a valve knob

A valve knob is a rotary knob located on the water or steam valve of a coffee machine. It serves as a handle that baristas or home users use to open and close the flow of hot water or steam needed for preparing beverages or frothing milk.

How to spot wear

Over time, the knob may become loose, overheat when in contact with steam, crack, or become harder to turn. A loose or damaged knob makes it difficult to precisely dose water or steam and can cause discomfort when handling it, or even steam leaking around the fitting.

Why you shouldn't put off the replacement

A functional knob ensures smooth and safe control of the valve. A damaged part increases the risk of burns or inaccurate control of the flow, which affects the quality of coffee preparation and milk frothing alike.

Selection advice

When choosing a replacement, follow the type of fitting and the thread size, which you can find in the compatibility table directly on the product page, to select a knob that matches your coffee machine.