Note: It is necessary to also replace the mechanical seal whenever a new motor or impeller is installed.These replacement parts are for the Cascade pumps, which are high-efficiency, industrial-grade pumps with high flow rates and good pressure. Standard Freshwater Seal Kit includes: (2) Drain plug O-rings (1) Bracket O-Ring (1) Bracket bore O-Ring (1) Freshwater Mechanical Seal, MPS-513 Saltwater Seal Kit includes: (2) Drain plug O-rings (1) Bracket O-Ring (1) Bracket bore O-Ring (1) Saltwater Mechanical Seal, MPS-517
