The Aston Seals ARA is a buffer seal designed for medium and heavy duty applications where spaces and friction need to be low. It can be used either as a single acting seal or in tandem configuration as a “primary” seal. Radial notches on the back facilitates back pumping and pressure relieve capability avoiding the risk of tipping. Radial slots on the front avoid risk of suction. The backup ring provides a very high resistance against extrusion in presence of pressure loads. It is used in the same housing normally destined to PTFE seal of which has similar dimensional characteristics but, compared to it, better sealing capabilities and greater easy installation.