Alloy Coolant Catch Tank, Jaguar XKs. Expertly crafted alloy radiator expansion tank. The tapered shape make them easy to mount in the tight underhood space of the XK models. Aluminum offers great heat dissipation and the good looks are undeniable. Made in England. Not supplied with cap. Order part number 17-703-2444 separately for a 7-pound cap or CO-18460 for a 4-pound cap. Dimensions: Height: 6" from bottom to top of cap flange. (A cap will add some height of course.) Length, without mount flanges: 10-1/8" Length, including mount flanges: 11-1/2" Width, Narrow End: 3-1/4" Width, Wide End: 5" Installation notes: This is designed for system pressure to be maintained at the tank, not the radiator. Fit a JA-EAC3424 "blank" cap at the radiator and a CO-18460 4-pound cap at the tank.