This is a replacement Piston head seal for the following Gamo air rifle.pistol models.
Please note, sometimes design changes during production, please ensure you require this seal which is the 25.5mm outer diameter version.

Gamo Center, PR45, 2000, 3000, 220, 440, Maxima, Multishot, Nitro 17, Recon, Shadow , Sporter 500, Stutzen , Trooper, Varmint, Viper, Whisper, Young Hunter, CF16, Delta, Expo 26, Expo S, Gamatic 85, 400, 600, 610, 85 Magnum 2000, Magnum 3000, R20, Ranger, Spectra, Trooper.