19.7mm aluminum nozzle with a single o-ring designed to be more resistent to oil / temperature and generally provides a longer service life, helping to keep a better air seal and nozzle alignment.
Our nozzles come with 2 o-rings, essentially a fat and a thin one, this gives you a choice of fitment since the outer diameter of cylinder head shafts can vary. As always please ensure you use small amount of silicone grease on the oring.
Please note, colour may vary.