fits mm
Walbron WYJ carburettor in smaller engine models (26 cc) where the "traditional" throttle, i.e. the air shut-off valve is located in the air filter housing, found e.g. in many Chinese small 2-T machines e.g. blowers, trimmers, water pumps, etc. etc.
It is not a replacement for Walbro's WYJ model where the carburettor itself has a ripple mechanism (automatic ripple versions).