Abstract: A sink trap assembly includes an upper vertical tubular part having a side wall with a tubular outlet securable to a horizontal outlet pipe. The upper part also has an open upper end and a lower open end to enable the tubular part to be installed by upward movement to position the upper end in sealing engagement with a lower surface of a sink around a strainer with the outlet of the tubular part being directed in any desired horizontal direction. The sink trap assembly also includes a lower part sealingly engageable with a lower end of a tubular part to close the lower open end thereof. At least one of the parts is secured to the strainer to retain the trap assembly in position.