NDIX CARBURETOR PUMP DISCHARGE VALVE. NEW-never used. screw diameter is 9mm. all sizes for the discharge hole are available.please indicate the one that suits your needs. top quality products. if you have any doubts-please ask before bidding. the price is for each unit. Before you check out please make sure to check all the products available in our store.simply go to the web page below and within the search space provided on the upper left hand corner type the key word/s of the product you are looking for. [https://stores.ebay.com/alfa1750scarburetorspartsstore] (https://stores.ebay.com/alfa1750scarburetorspartsstore) payment accepted are; visa/mastercard paypal thanx for looking.