Replacement Parts for RBC, Rotating Biological Contactor, Hormel Water Treatment System, and Lyco Water Treatment System. Due to a parts overrun on the refurbishing of our sewer system we now have some excess replacement parts available for the above systems. The parts that are available are: #12267-03 Grommet Strap for Media Replacement #12158-01060 Grommet #12487-01670 Grommet Cap. Call 815-244-4424 for details and pricing