The Delavan 6900 DSS-R Diamond S.S. Roller Pump can be used to pump nonabrasive liquids. This particular product has permanently-lubricated, sealed bearings and is housed in DiamondTM stainless steel. The shaft seals are a Viton cartridge lip seal. In order to avoid damage, the 6-roller pump should not be run dry. Most commonly, this pump is used in the agricultural sector.