Gas cap vent 

Part # 1110-353-1600 / 11103531600

New old stock part from closed out dealer

Fits many Stihl chainsaw models, including: 032, ms200, ms 200 T, 088, 066, 050, 051, 024, 020, 020 T, 030, 031, 046, 076, 064, 030, 015, ms 640, 036 QS