The cap used as fuel cap (Part# 000 0350 0525) on the following models: <br /> MS171, MS181, MS192, MS192T, MS200, MS210, MS211, MS230, MS240, MS250, MS260, MS340, MS360, MS380, MS381, HT100,HT101,HT250,HT130,HT131 <br /> The cap can be used as oil cap (0000 350 0526) on the following chainsaws: <br /> MS880, MS460, MS441, MS440, MS391, MS390, MS362, MS361, MS311, MS290, MS280, MS270