Excellent kit for servicing Anschutz 8002, 9003 & 9015 air rifles.
If you have an Anschutz 8002/9003/9015 running at 12fpe then the o rings do not last forever especially if you use the rifle outdoors in all weathers as I do.
I estimate that the seals will need replacing roughly every 5 years in order to ensure that your rifle doesn't let you down in the middle of a competition.
This kit gives you all the o rings needed to replace everything that could fail on the rifle. If you are reasonably competent at fixing then it's not that hard to DIY.