Wye connects a sewer system pipe to another pipe or outlet that moves waste out of your RV or motorhome. Y-shaped fitting has (3) 1-1/2" hubs that slide onto pipes.

Sanitary tee connects a sewer system pipe to another pipe or outlet that moves waste out of your RV or motorhome. T-shaped fitting has (3) 1-1/2" hubs that slide onto pipes.