Equivalent to a Davey 400558SP. Heavy duty pump mechanical seal Type MG1 with Nitrile Rubber seals and Silicone Carbide faces to suit 14mm shaft . This is for salt water or abrasive fluids and sand where a carbon ceramic seal will quickly wear. If you want to find out more about mechanical seals check out our blogs  Mechanical Seal Types Explained: Which One Does Your Pump Need?  and Mechanical Seals: Keeping all that pressure inside your pump where it needs to be