O-ring SCHAERER Spare Parts 062681 3370062681

An O-ring forms a seal between two surfaces by compressing its circular cross-section. When fitted into a groove, the ring is squeezed slightly, creating pressure that blocks liquids or gases from passing through. This method relies on the elasticity of the material rather than adhesives or mechanical fasteners, so the seal remains flexible and can be removed or replaced without damaging the equipment.

To use the O-ring, the operator first switches off and isolates the appliance. The old ring is prised out of its groove with a non-metallic tool to avoid scratching the metal. The new O-ring is positioned over the groove and pressed into place by hand, ensuring it sits evenly without twisting. Once the mating surface is cleaned and refitted, the appliance is reassembled and power restored. The seal is tested under normal operating pressure to confirm there are no leaks.

The O-ring is made of EPDM rubber with a hardness of 70 Shore A, which gives it resistance to hot water, steam and cleaning chemicals typical in coffee equipment. The black colour is standard for this grade and does not affect performance. Its dimensions—3.69 mm internal diameter and 1.78 mm cross-section—determine the groove size it fits, so it matches only the parts designed for it.

This spare part is a direct replacement for the O-rings used in specified SCHAERER coffee machines and grinders. It is listed in the manufacturer's spare-parts catalogue under the coffee-machine section.