Hdl produce and stock a range of seals to suit several viking® Pumps, including the positive displacement and rotary lobe pumps. The hdl type 89 is a specific design to replace the original seals found in the popular viking® 4225 pump range, and has the double-pinned seat required for the housings on this pump type. Seals are available from stock with inserted silicon carbide faces on both the rotary and stationary. Fitted with viton® 'o'-rings. Other 'o'-ring and face materials are available, if specified at time of order.