There are five standard types of colour coded box for easy identification, which are highly regarded as a necessity by plumbers
Each box contains a varied size range of the following Ballvalve Seat Fibre Washers, Flexible Tap Connector Washers, Washing Machine Hose Rubber Washers, Top Of Tap Body Fibre Washers, Shower Hose Rubber Washers, Bath Shower Diverter Washers, Washing Machine Hose Filter Washers, Hot Water Bottle Washers, Rubber Draw Off Cock Washers and Fibre Draw Off Cock Washers