an air pressure less than atmospheric. Also, implies siphonage in piping system.

see Backflow Preventer.

a pipe or opening used for ensuring the circulation of air in a plumbing system and for relieving the negative pressure exerted on trap seals.

the vertical vent pipe installed primarily for providing circulation of air to and from any part of the soil, waste of the drainage system.

pipes installed to provide flow of air to or from a drainage system or to provide a circulation of air within such system to protect traps seals from siphonage and back pressure.

any pipe or fitting installed in a vertical position or which forms an angle of not more than forty-five (45) degrees with the vertical line.

see Liquid Waste and Industrial Waste.

a pipe, which conveys only wastewater or liquid waste free of fecal matter.

a device which conditions or treats water supply to improve water quality, remove suspended solids by filtration.

a pipe which conveys potable water from the building supply pipe to the plumbing fixtures and other water outlets.

or street main is the water-supply pipe for public or community use.

of a building or premises consists of the water service pipe, water supply line, water distributing pipe and the necessary branch pipes, fittings, valves and all appurtenances required for the supply of potable water.

that portion of a vent pipe through where wastewater also flows through.

any joint or seam obtained by the joining of metal parts in a plastic molTen state.

a person who specializes in the welding of pipes and holds a valid certificate of competency from a recognized testing agency, based on the requirements of the regulating authority.

a hose connection with two-gated outlets permitting two connections of the same or smaller coupling diameter to be taken from a single supply line. Also, a pipe fitting of three branches that form the letter "___"

an open. unoccupied space, other than a court, unobstructed from the ground to the sky, except where specifically provided in this Code.

a pipe connecting upward from a soil or waste stack below the floor and below horizontal connection to an adjacent vent stack at a point above the floor and higher than highest spill level of fixtures for preventing pressure changes in the stacks.