SERIES:- 21C and 21R
SERIES 21C and 21R are designed for extremely corrosive chemicals, including concentrated acids and salts, strong oxidising and reducing agents, and chemically active organic compounds. All components which come in contact with the liquid being sealed are made of chemically inert material. Metallic components clamping ring and springs are located outside the pump stuffing box.

SERIES 21C : In this seal type Glass filled PTFE face is composite moulded with highly flexible PTFE bellows.

SERIES 21R : It is a seal similar to Type 21C in design with replaceable seal ring. This permits easy removal and replacements of the seal ring, a cost saving feature. In this type different face materials can be used to handle a wide range of corrosive and abrasive liquids.