Viton Valve Seals can handle higher temperatures and have better wear resistance. These will work in 50cc 4-stroke QMB139 engines, 150cc and 125cc GY6 4-stroke QMI152/157 and QMJ152/157 engines, 150cc GY6 4-stroke ZNEN engines and 250cc 4-stroke water-cooled CN250 172mm engines. May fit other engines.

• Inner Diameter: 4.5mm
• Outer Diameter: 10.8mm
• Height: 8.1mm
• 2 Piece set