How to Replace the Insulating Glass in alfi Juwel/Opal 1.5 L

By alfi® – Isoliergefäße der Premiumklasse | Published: 2026-10-30

Category: How-to Guides

Learn how to swap the 1.5 L insulating glass with sealing ring in your alfi Juwel or Opal vacuum jug, plus tips to avoid leaks and breakage.

Quick answer

To replace the insulating glass in your alfi Juwel or Opal 1.5 L jug, order the matching replacement glass with sealing ring, then follow the simple swap steps below to keep your jug leak-free and performing well.

Why use the correct replacement glass

The alfi Juwel and Opal series are designed for a 1.5 L capacity, and the replacement glass is built to fit those jugs exactly. Using a different size or type could leave gaps that let heat escape or cause leaks.

The replacement part comes with a sealing ring, which is essential for a tight fit. If you reuse an old ring, it may be worn and fail to seal properly.

Always check the model and capacity of your jug before ordering. The replacement glass is specifically for Juwel/Opal 1.5 L models, so verify that your jug matches.

What to check before you start

Make sure your jug is empty and at room temperature before you begin. Hot or cold liquids can make the glass brittle and more likely to crack during handling.

Inspect the old glass for cracks or chips. If you see any damage, replace it immediately to avoid breakage and potential injury.

Have a soft cloth or towel ready to cushion the glass as you work. This reduces the risk of dropping it on a hard surface.

Step-by-step replacement guide

Empty and prepare the jug: Remove any liquid and let the jug reach room temperature. Place a soft cloth on your work surface to protect the glass. Never attempt to replace glass while the jug is still hot or cold.
Remove the old glass and sealing ring: Carefully pull the old glass out of the jug body. If it is stuck, gently twist it while pulling. Then remove the old sealing ring from the glass or the jug neck. Inspect the old ring for cracks or flattening; if it is damaged, do not reuse it.
Install the new sealing ring: Fit the new sealing ring onto the new glass, making sure it sits evenly in the groove. Press it down around the entire circumference. A twisted or partially seated ring can cause leaks.
Insert the new glass into the jug: Lower the glass into the jug body, aligning it with the opening. Press down gently until it seats firmly. Do not force it. If it does not slide in easily, check that the ring is not bunched up.
Test for leaks and proper fit: Fill the jug with water, close the lid, and tilt it over a sink to check for leaks. Also confirm the lid screws on smoothly. If you see leaks, remove the glass and reseat the ring.

The right replacement part

Isolierglas mit Dichtungsring, silber, Juwel/Opal 1,50 l: This alfi replacement part is a glass insulating flask with a sealing ring, designed for use with Juwel/Opal vacuum jugs. It ensures a perfect fit and a tight seal, so your jug keeps drinks hot or cold without leaking.
Isolierglas mit Dichtungsring, silber, Juwel/Opal 1,50 l