Up for sale I've got some extra Atlas Copco Multiflex 1/4 NPT fittings. These are absolutely AWESOME fittings - they allow the compressed air line to swivel freely around the tool, making it almost weightless.

From Atlas:

The MultiFlex swivel is an ingenious multi-directional connector that bends and rotates in all directions while the hose remains straight, making it easy to operate in spaces with poor accessibility. In the MultiFlex, the air passes through a continuous section, whatever the angle of the swivel, thus ensuring minimum pressure drop to the tool and maximum productivity. Made from special aluminum, with high toughness, they can stand up to the roughest handling.