New Triumph Amal Concentric Carb “Thick” Flange O-Ring. This O-Ring is the “Thick” version that Measures approx .100″ thick. Fits Triumph 650 Unit Twins (Bonneville, T120R, Tiger, TR6, TR7, T140, Etc) from approx 1968 & On with the Amal 900 Series Concentric Carb. This O-Ring was used to isolate the Carb from the Manifold to prevent Damage from Heat & Vibration. Can also be used on BSA & Norton Models! Please refer to your parts catalog for proper fitment.*****Always check your parts book to ensure the Best Fitment! May fit other models that are not listed abouve!*****Made in EnglandO.E.M Part number is 70-9711 or E9711