HATSAN 27mm OD Piston Seal - Fits MOST Hatsan Break Barrel or Underlever Air Rifles
Hatsan 27mm OD Piston Seal, suitable for most Hatsan break barrel and underlever rifles ( NOT for the Striker Air Rifle Which uses the 27.7 OD washer )
This is the seal / washer that goes onto the end of the piston. and seals the piston to drive the air forward into the barrel, Often worth replacing when you change the spring. If this seal is damaged, air escapes down the side of the piston and you loose power so it's also worth checking the seal if you experience power loss.