Poweka Carb Carburetor with Gasket Fit for Stihl Ms170 Ms180 017 018 Chainsaw Parts New high quality replacement Zama carburetor Fit stihl ms170 ms180 017 018 Package includes 1pc carb + 1pc gasket There are two kinds of carburetor for MS170 and MS180, one with a HUMP on the top and another one without it.This one is with a HUMP on the top of the carburetor. ASIN of the one without HUMP is B00AO1FQ0Y, please compare it with your original before ordering it, lots of customers always make the mistake for both carburetors, TKS.