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? :
Washing Machine Trap Adaptor - 1.1/2/40mm - 11190
Kitchen Sink P Trap With 2 Washing Machine Waste Pipe Spigot Connections | Stevenson Plumbing & Electrical Supplies
plumbing - How do I connect both my dishwasher and washing machine waste pipe to the same sink? - Home Improvement Stack Exchange