Poweka New Pack Of Carburetor Carb  Gasket Fit For Stihl 017 018 Ms170 Ms180 Chainsaw Engine Parts New high quality replacement carburetor Fit stihl ms170 ms180 017 018 Package includes 1pc carb + 1pc gasket There are two kinds of carburetor for MS170 and MS180, one without a HUMP on the top and another one with it.This one is without a HUMP on the top of the carburetor. ASIN of the one with HUMP is B00B8OSUSQ, please compare it with your original before ordering it, lots of customers always make the mistake for both carburetors, TKS.