Reply To: P & S Trap toilets Home › Forums › Public Forums › General Plumbing › P & S Trap toilets › Reply To: P & S Trap toilets 8 Jun 2004 at 12:22 pm #295841 Retired plbg1 The S traps drains through the floor and are made with vent and without vent. The P trap drains into the wall inlet. We use P traps for fl. drs. and all kinds of drains.