Is all Quadrant Shower Trays basically the same shape? In the UK most of the shower trays sold are quadrant trays which have a standard rectangular radius of up to 550 degrees inclusive of an adjustable thermostat. In other words the entire quadrant shower tray is shaped like a rectangle. If there are more than one of these units, then the shape will vary slightly from this. All other things being equal then the cost of the unit should be roughly the same.