installation - installing a P-trap for the washing machine with this layout, will it convert to S-trap or causing problem? - Home Improvement Stack Exchange
Water squirts out top P-trap every time washing machine starts in new house. Any ideas? More info in comments : r/Plumbing
40mm (1-1/2") P Trap With Washing Machine Waste Pipe Spigot Connection
Do you have to have a p-trap on a washing machine drain? - Quora
Septic System: How to Filter Out Laundry Lint (DIY) | Family Handyman
Is that where I should plug the washing machine drain hose? : r/Plumbing
Do you have to have a p-trap on a washing machine drain? - Quora