This brass plug holds the fuel filter screen in place in the top cover of the Weber 32/36 DGV carburetor. Weber parts lists call it a "strainer inspection plug." Fits 32/36 DGV (including DGAV / DGEV and DGAS / DGES variants), 32/36 DFAV / DFEV, and 32 DIR. The Fuel Filter Screen Element (Part No. 1586-11) is sold separately.