Perforated metal plates, fitted over the outside of injection sea cocks to prevent entrance of foreign substances to the ship's pumps and piping system.
Iipleyiti ezigqojoziweyo zesinyithi, ezifakelwe ngaphezu komphandle wee-"cocks" zesitofu solwandle ukuthintela ukungena kwezinto zangaphandle kwiimpompo nakumathumbu eenqanawe