Offered with Closed Impeller. 2. Impellers are provided Back Wear Ring to minimize Axial Thrust and Gland Leakage. 3. Flange Rating PN 16 to PN 64 . 4. Various Shaft Sealing Available are Gland Packing (ASB. NON ASB. depending on the service.)Moulded Graphite Rings. (GRAFOIL PACKING) c. Mechanical Seals.