https://www.sanpingmachinery.com/products/bushing/ The Sanping Bushing Seal is designed to be used as a mechanical seal between two stationary components. It is typically used to seal the gap between a rotating shaft and a stationary housing or bearing. The throat bushing Seal is an elastomeric seal which consists of an inner ring, an outer ring, and a sealing element. The inner ring is usually made of a durable material such as steel or stainless steel, while the outer ring is usually made of a softer material such as rubber or polyurethane. The sealing element is typically a rubber O-ring or other elastomeric material. The Sanping Bushing Seal is designed to provide a tight and reliable seal between two components which are in relative motion.All Rights Reserved