High performance red OR black (no choice just depends what’s in stock) 90 shore hardness Cylinder Seals for the Weihrauch HW100. This is the seal that goes on the brass nipple in the block where the cylinder screws in. Typically the most common seal to fail/shred resulting in leaking - these are considered "consumables" so it's always a good idea to keep a few handy. These are up-graded, high performance seals, harder than the original spec. seals.
Easy to fit - just unscrew the cylinder from the HW100/101 then remove the old oring and replace with the new one. Before screwing the cylinder back on, add a thin layer of molykote or oil to the oring. As with any seal you are replacing on your HW100 - be careful not to scratch the surfaces when removing the old oring. These seals are for Weihrauch HW100 & HW101 Part number 2665d (Inlet Valve A).