A trap for positioning within a wall urinal includes a housing having an open top end and an open bottom end coupled to a drainage pipe. The trap includes a top that includes an upper surface with a center portion having at least one drainage opening extending therethrough. The top is to be coupled to the open top end of the housing. A drainage tube has an open top end and an open bottom end, with the open top end coupled to the center portion of the top and aligned with the at least one drainage opening. A cup is to be suspended within the housing and has an open top end and a closed bottom end with sidewalls therebetween, and with the open bottom end of the drainage tube inserted into the cup.