Service Kit f/18590 Macerator Pumps. For older pumps with brass studs, washers and acorn nuts. **Stainless Steel Bolt Kit - (17288-1000) sku-56848 - must be purchased**WARNING: This product can expose you to chemicals including NICKEL (METALLIC) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.