DOP188-12 Walbro Primer Bulb No. 188-12.
This is a true OEM Walbro Primer bulb. Fits Walbro WA, WT, WY, WYJ, WYK, WYL, WYP and WZ series carburetors that use a 3/4" outside diameter x 9/16" height. Replaces part walbro part number 188-12-1 and oregon part number 49-020.