Kral Puncher Main exhaust Valve Spring

Replacement main valve / exhaust spring for the following Kral air rifles:

Kral Puncher
Kral Puncher Breaker
Kral Puncher Pro
Kral Puncher Armour
Kral Puncher Maxi
Kral Puncher Standard
Kral Puncher Mega
Kral Puncher Evo
Kral Puncher NP-01
Kral Puncher NP-03