definition of terms

• air gap - unobstructed vertical distance
• back flow - flow of water into the distributing pipes of a potable supply of water
• back siphonage - refers to the back flow of used contaminated or polluted water
• bib - synonymous with faucet, cock, tap, plug
• blind flange - closes the end of a pipe
• blow off - controlled outlet on a pipeline
• branch - any part of piping system other than the main riser or stack
• branch vent- vent connecting one or more individual vents with a vent stack or stack vent
• circuit vent - a branch vent that serves two or more traps and extend from the front of the last fixture
• combination waste and vent system - is a specially designed system of waste piping embodying the horizontal wet venting of one or more sinks or floor drains
• common vent - is a drain from two or three fixture connected to a single trap. Also called dual vent
• drainage system - all pipings within the public or private premises that conveys sewage rainwater or other liquid waste
• dry vent - does not carry water
• fixture branch - pipe connecting several fixtures
• fixture drain - drain from the trap of a fixture
• fixture supply - water supply pipe connecting the fixture with the fixture branch
• flush valve - device located at the bottom of the tank for flushing water closets
• flushometer valve - device which discharge a predetermined quantity of water to the fixture
• horizontal pipe - angle of more than 45 degrees with the vertical
• liquid waste - discharge from any fixture which does not receive fecal matter
• local vent pipe - pipe on the fixture side of the trap through which a vapor or foul air is removed from a room or ficture
• main sewer - a sewer line or system directly controlled by public authority
• main vent- principal artery of the venting system to which vent branches may be connected
• plumbing fixtures - installed receptacles
• plumbing system - includes water supply distribution pipies
• stack - vertical main of a system of soil, waste or vent pipe