This performance filter has even better airflow ability, since there is an added inner cone of filter material in the center- also helping straighten out the air flow entering the carb.
Fits all carbs with filter-side diameters between 47-50mm, such as most OKO/PWK carbs with throat size 21 to 28mm (PWK21/OKO21-PWK28/OKO28). Includes screw (hose) clamp.