This plain black replacement knob fits food server pump models 81000, 81010, 81200, 81240, 81320, 81470, 82100, 82420, 82500, 82510, 82540, 84520, 84530, 84540, 84550, 84600, 84610, 84620, 84630, 84850, 84860, 84870, 84880, 85050, 85900, 86500 and 86580. 256360Server Products