Original jet DELLORTO with 5mm x 0.75mm thread tested in production. Used as secondary jet in a lot Dellorto carburetors like PHBL/VHS and main jet for Dellorto PHBG,PHBD,SHA,SHB, VHB CS и CD, and many from the early models of Dellorto carburetors.The jets are just as important as the variator rol..