Trap terminology

Plumbing · Floor Drains · printed page 290 (PDF page 291)

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Book index entries

Plumbing

Text in the illustration

tail piece (or fixture outlet pipe)
inlet
trap adapter
outlet
trap arm (or fixture drain)
trap dip (upper dip)
trap seal depth
trap weir (crown weir)
trap seal depth must be at least 1-1/2" to 2" (and not more than 4" according to some authorities)
P-trap (with cleanout)
cleanout
lower dip
cross section

Generated explanation

The illustration shows a cross section of a P-trap with a bottom cleanout, connected to a vertical fixture tail piece through a trap adapter. The curved outlet leads into a horizontal trap arm, also identified as the fixture drain. Blue shading depicts retained water, with its surface at the trap weir elevation. A vertical dimension identifies the trap seal depth between the water surface and the upper dip. An annotation specifies a seal depth of at least 1-1/2 to 2 inches and no more than 4 inches according to some authorities.

Components

P-trap tail piece trap adapter trap inlet trap outlet trap arm trap weir upper dip lower dip cleanout

Related illustrations

1616

Trap terminology

· p. 285

A cross section of a P-trap identifies the terminology for its inlet, bends, outlet, and retained water seal. A vertical fixture tail piece connects through a trap adapter to the inlet, and the outlet extends horizontall