Ball and spring Oilpump

Reducing valve for B20/B30 oil pump Should also be replaced at B19/B21/B23 with older type of oil pump Also suitable for some B230 pumps. There have been different manufacturers of oil pumps, therefore ball / feather may not fit all models. Measure your pump to be sure. The ball is 12,7mmØ. The original plunch may stick when it becomes worn. Remove plunch / spring / stick, replace these 3 parts with these 2 parts ball + spring.