Renn Sport air filter, 35mm connection, high-quality filter material, high air flow, optimum filtration. Outer Ø approx. 74mm, length approx. 68mm. Suitable for Puch, Zündapp, Hercules, KTM, DKW, Simson, Kreidler. Not STVZO-compliant, operating license expires. Adaptation/tuning work necessary, buyer responsible. Return only undamaged and original. Check/adjust timing, ignition, carburetor tuning. Purchase only on acceptance.