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The Two Socket Cross or A22 is used to provide a connection of 90° between a vertical tube and horizontal rail which often features in middle or lower parts of guardrail structures. The ‘through’ tube will fit vertically (not joined) within the key clamp and two other tubes will fit into each side, both horizontally. A regularly used tube clamp fitting, the Two Socket Cross is often complimented by the incorporation of a Long Tee (A4) fitting into top rails of a guardrail application. Tubing with a 48.3mm outside diameter (Size 8) is correct for this type of fitting.