These tanks will give a surprising amount of volume in a tight space. A couple of things need to be considered. The tank must basically lay flat. It cannot be suspended by straps or ropes. The inlet is via a 38mm (1-1/2"") BSP male and outlet via a 12mm. These inlets are positioned so that the inlet at the logical top of the tank and the outlet the bottom. The tank will not completely empty, probably only 95%. The tanks are made out of a plastic that won't taint the flavour of the water.