Security for your oil tank. Fits onto your exiting 2” fill point. - Its clever design utilises a patented system which means that when the cap is locked, it spins freely & is almost impossible for anybody to remove without the key. - Free spin design when locked in place. - Eliminates crow bar access. - Easy to fit. No installation tools required. - One piece design. Integral lock so no exposed or weak padlocks. - Supplied with three keys. Up to 50,000 locking combinations.