Dellorto NOS air filter adaptor elbow for UB/UA 20-24mm & VHB 20-26mm carbs. The elbow has 32x1.25mm Female threads on the clamp side and 39x1.25mm Male threads on the other.
NOTE: The F20 air filter comes in two thread sizes: 32x1.25 and 39x1.25mm. These elbows will only fit the F20 air filters with the larger 39mm threads. PLEASE check your filter thread size before ordering.