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Port to dash adapters are used to transition fluid flow from a larger hole to a smaller port with the least amount of flow disturbance. Compressing a rubber O-ring to provide a positive seal is used by BSP and SAE. The O-ring seal, also called the elastomeric seal, offers the highest seal reliability, due to the rubber O-ring's ability to absorb damping. Adapting an O-ring, or port seal, to replace any pipe thread is easy.