S-Trap Example

S-Trap drains are often prohibited because unlike P-Trap drains, S-Trap drains easily lose their water seal.

Plastic S-Trap in Package

The parts of the S-Trap include a J-Bend.  The J-bend is also used in the P-Trap.  The S-Trap is also made up of a curved sink trap, which attaches the J-bend to the floor pipe.

The J-Bend (labeled C), Raised Sink Trap, and elongated Floor Pipe.

Center to End and Thread Engagement measurements on the J Bend and Sink Trap.  Fitting allowance calculations on the J Bend and Sink Trap.  End to End, Inside Diameter and Outside Diameter measurements on the floor drain.

Inside, outside, and end to end measurements on the washers.  Thread engagement measurement on the threaded connector.

Parts and measurements.