Many of our models come with our patented O-Pro® Seal which dramatically reduces leaks. O-Pro® Seals utilize a series of O-rings to create a robust seal and lubrication chamber, all in one. O-Pro® Barrier seal functions as both a seal and bracket bushing; O-Pro® Cartridge & Guard seals are simple retrofit options. This means a safe, clean environment for your staff and money saved from lost product.