On S Trap and P Trap

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S trap and P trap are Mechanical terms that relate to sanitary plumbings. Both types of pipes are used at the discharge point of grey water and black water. To be put simply, both are bent pipe systems. The bends are to ensure that the grey/ black water do not back flow, and ensure that the stack it discharges to does not allow rats, insects and bacteria to travel back into the WC/ tap point. In addition, they help to trap objects not intended to flow down the pipes at the curve.

S trap
  • Pipe is in the shape of a S
  • (Sometimes considered) an older design
  • In Singapore, used more for WCs, but may also be applied to sinks and floor traps
  • Require more space for the S bend


P trap
  • Pipe is in the shape of a P
  • (Sometimes considered) a newer design
  • In Singapore, used more for sinks and floor traps
  • Require less space for the P bend
For both cases, because the bends tend to collect objects and sediments, maintenance on the bent portions are necessary in order to ensure a well functioning system.

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