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This Viton bottom-cushion fuel injector O-ring is a large Honda intake manifold adapter sized at 21.3mm outer diameter and 13.7mm inner diameter. Sold as the bottom adapter cushion for Denso-style fuel injectors, the Viton material offers chemical and temperature resistance appropriate for fuel system sealing where the specified dimensions and bottom-cushion role are required.
Grams Performance Honda Cushion Large O-Ring 21.3mm OD 13.7mm ID
