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The Short Swivel Inline or A21 is used mainly as a pair but is sold separately. It has the ability to position rails (tubes) in various directions and creates angles which are between 90 and 180°. The fitting requires a tube to go through the centre, with two other tubes fitting into each side. All three tubes should be Size 8 and have an outside diameter of 48.3mm. A Variable Elbow (A7) tube clamp fitting can be used instead if alterations of angles are required.