Description

The HW100 O-Ring 5.5×1 is an original-spec replacement seal used in the Weihrauch HW100 PCP air rifle platform. This O-ring is positioned in the breech or probe sealing area and ensures an airtight connection between the barrel and the air system when the rifle is fired.

Manufactured to match the factory dimensions (5.5 mm inner diameter with 1 mm thickness), it helps maintain stable pressure, reliable cycling, and consistent shot performance. It is commonly replaced during routine maintenance or when air leakage or wear is observed. The component appears in the official HW100 parts diagram as the O-ring for the 5.5 mm caliber configuration.