PUMP BUCKETS – NEOPRENE
The seals used in brass windmill pumps and differential compensators are called either Cups or Buckets. – They are therefore, either Pump Cups or Pump Buckets, or Diff Cups or Diff Buckets. They are available in Leather, Neoprene, or Nitrile. The Pump Cups are sometimes referred to as having a “large hole”, while the Diff Cups are called “small hole”.