Description

The HW100 O-Ring 2.57×1.78 (Part No. 2703B) is a precision sealing component used in the Weihrauch HW100 PCP air rifle platform. This small O-ring is installed in the adaptor B or main valve inlet section of the rifle, where it helps maintain airtight sealing and prevents pressure loss during operation. Manufactured to match factory specifications, it is commonly replaced during routine maintenance, seal kit replacement, or full rifle servicing. Using the correct size O-ring ensures consistent air pressure, reliable performance, and proper functioning of the rifle’s internal valve system.