This intake manifold is designed to work with 19mm carburetors in 4-stroke machines. It will fit many 50cc to 110cc engines in ATVs, Dirt Bikes, and Scooters. Commonly used in conjunction with a PZ19 carb. Opening is 20.1mm, the mounting holes are 4.8mm and 5.5mm apart centre to centre respectively. This is very similar to part 20A9190 though the bend is more pronounced on this model, largely interchangeable although some applications with tight tolerance will require the distinction.