Drain Waste Trap Pipe Connector 1 1/2" BSP x 40mm with Single Dishwasher Input | Fruugo US
Washing machine (right) and dishwasher (left) wastes connect to kitchen sink trap. It often smells when the washing machine is running, any ideas as to how I can stop that from happening? :
FloPlast Double nozzle Appliance Trap (Dia)40mm | DIY at B&Q