Retaining ring 58mm – Replacement part for KM portafilter head

• Secure Grip for the Basket: The ring provides the necessary clamping tension in the portafilter, ensuring the basket doesn't fall out when knocking out the coffee grounds.
• Precise Fit (58mm): Custom-designed for Kaffeemacher portafilter heads (bottomless and with dual spout) in the 58mm standard size.
• Robust Spring Steel: Resistant to moisture, heat, and sustained mechanical stress from repeated insertion and removal.
• Quick Replacement: Can be inserted into the inner groove of the portafilter head in seconds without special tools.

When should you replace the retention ring?

There are two typical scenarios for this replacement purchase:

1. The classic cleaning mishap: You've removed the basket for thorough cleaning, rinsed out the portafilter, and the ring has slipped unnoticed down the drain.
2. Loss of tension: If you insert and remove your basket very frequently, the steel can gradually fatigue over time. You'll notice this when the basket flies out along with the coffee puck when knocking it against the knock box.

Compatibility: Does this retention ring fit your portafilter?

This retention ring was developed as a direct replacement part for the following products in our range:

• KM Portafilter Head Bottomless (58mm)
• KM Portafilter Head with Dual Spout (58mm)

Important Note About Third-Party Manufacturers: While 58mm is the standard size for most prosumer portafilters, the depth, thickness, and shape of the retention groove vary slightly from manufacturer to manufacturer. We have precisely measured this ring for our Kaffeemacher house-brand portafilters and can only guarantee proper fit and function for these models.