SM-81 Seals are designed to handle clear liquids under normal PV condition. This type of seal do not require step on the shafts for installation, due to which, this are preferred choice for double tandem arrangements with external seal support systems & device. These seal required lower stuffing box for installation. These types of seals are used in Petrochemicals, Petroleum Refinery, Solvents, Hydrocarbons & General Industrial fluids.