CHAINSAW OIL PUMP FOR MODELS: 1900 1950 1975 2050 2055 2075 2150 2155 2175 2250 2375 2450 255 SM 4018 PP220 PP260 P3314 P3416 P3516 P3818 P4018 PP351 PP381 PPB4018 PPB4218 S1970 SM4218 11-TOOTH POULAN SHAFT CODE:54. 230.1901 ORIGINAL CODE: 530-07-18-91 ALSO COMPATIBLE WITH: MC CULLOCH MODELS: MAC7-40 MAC740 11-TOOTH SHAFT ORIGINAL CODE: POULAN 530-07-18-91 CZ