Series B88B1 is multiple springs externally mounted reverse balanced seal with O-ring as secondary sealing member. Various seal face materials and elastomers can be offered for wide service application. This seal can also be used for corrosive services as the metallic components do not come in contact with liquid to be sealed. This seal can also install in double back to back arrangement as a internal seal. Even if barrier fluid pressure goes down this seal will not allow process fluid to mix with barrier fluid, Hence it is called reverse balanced seal.