Description

The HW100 O-Ring 4.5×1 (Part No. 2659B) is an original-spec replacement seal used in the Weihrauch HW100 PCP air rifle platform, specifically for the .177 (4.5 mm) caliber configuration. This component is installed in the valve block or breech sealing area depending on the assembly version and helps maintain an airtight seal during operation.

Manufactured to the precise dimension of 4.5 mm inner diameter and 1 mm cross-section, the O-ring ensures stable air pressure, reliable cycling, and consistent shot performance. Like other seals in PCP air rifles, it may require periodic replacement during maintenance when wear or air leakage occurs.