Includes provision boss for level sensor. Supplied with swirl pot connection as standard. Available without swirl pot connection to special order. All Bailey alloy header tanks are designed as direct replacements requiring no special hoses or tools to enable fitment. They are fabricated from high quality aluminium, which is then highly polished to a mirror-like finish, and are supplied with a high pressure cap. Their benefits include: HIGH STRENGTH - Standard plastic tanks can crack or split with age (especially on high powered turbo charged cars running lots of boost!) but a Bailey tank is indestructible, even on 500+BHP race cars. CONSTANT PRESSURE - By using a 1.3 Bar (19psi) cap, it raises the pressure within the cooling system which effectively raises the boiling point of the water, keeping the car cooler for longer. COOL LOOKS THAT LAST - Never has a simple water tank looked so good! Used on many show winning and magazine feature cars and if regularly polished will probably outlast the car!