This is a brand new Gas Tank Cap.It is universal part for most Chinese 50cc 70cc 90cc 110cc ATV 4 Wheelers, Such as TaoTao, Buyang, NST, BMX, Coolport, Sunl, Roketa etc.It also fits for 4 stroke 50cc 70cc 90cc 110cc Small Chinese Quad, ATV, Motorcross, Pit Bike.Inside diameter : 40mm