19231-ZZ3-000 Impeller Cover - Overview. The 19231-ZZ3-000 Impeller Cover is a crucial component in Honda marine engine systems, specifically supporting the water pump system. It serves as a protective housing for the impeller, playing an essential role in maintaining efficient water flow and preventing debris from entering the pump assembly. By ensuring a secure fit within the cooling system, it helps keep the marine engine operating reliably and at optimal temperatures. Manufactured to exact H