HW100 'O' rings.

[Hawkstone]

A search on the web came up with this list of 'O' rings for the Weihrauch HW100, but which rings are suitable for the fill probe?

Here's the full list of factory O-rings and the two recommended alternatives (bolded)

O-ring HW 100, 37.1 x 1.6 Cylinder clamp 2682C
O-ring HW 100, 15.6 x 2.5 Barrel clamp 2682B
O-ring HW 100, 32 x 2 Magazine 2603A*
O-ring HW 100, 13 x 2 Adaptor A 2704
O-ring HW 100, 2.57 x 1.78 Adaptor B 2703B

O-ring HW 100, 3 x 1.5 Valve stem 2655D
O-ring HW 100, 12 x 1.2 Breech block main (12 x 1) recommended 2658
O-ring HW 100, 5.5 x 1 Breech/probe seal .22 2659A*
O-ring HW 100, 4.5 x 1 Breech/probe seal .177 2659A*
O-ring HW 100, 4 x 1.5 Probe buffer 2618A*
O-ring HW 100, 2.57 x 1.78 Main valve inlet 2665D
O-ring HW 100, 7 x 1.5 Main valve outlet 2666
O-ring HW 100, 2 x 2 Main valve internal (2.57 x 1.78) recommended N/A
O-ring HW 100, 7 x 1.5 Regulator piston 2668
O-ring HW 100, 10 x 1.5 Tension adjuster (sometimes omitted) 2672
O-ring HW 100, 8 x 1.5 Barrel 2679

Don't waste money on others "seal kits" Source them yourself. You can buy a lifetimes supply for £10 - £15 and in the right sizes 8) Try your local hydraulics shop for the common imperial sizes #005 + #009 or look online. Be aware, there is nothing to be gained from using harder O-rings than the std 70shore, in fact if O-rings are too hard they may not deform sufficiently to seal.