ESA O-Ring for ESA-probe Ø 8mm.
With proper care and grease, this O-ring remain functional during normal seasonal operations in our latitudes for a very long time.
Should they need to be replaced we recommend using a hardness of 70 (NBR or FKM).

Material: NBR 70, FKM 70
End piece: ESA Probe
Dimensions: 5x1.5