Elements CL Sub-Element 1800 x 900 Centre (3 Pieces) Elements CL S (EMSE-50-9018)Rectangular Sub Element with Square End Centre Drain 1800x900x80mm This rectangular sub element is designed for use with standard 40mm height shower trays that feature a square drain. It is suitable for both end and centre drain positions. Extra 80mm sub element height allows for: A larger step to the showering area if desired Installing a shower tray where it is not possible to site the drain within the floor Longer runs for drainage pipework to