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August 16, 2017

Brass Fittings Used In Drainage Vents

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Because they operate at low pressure and rely on gravity to move fluids, drainage systems use fittings whose interior surfaces are as smooth as possible. The fittings may be “belled” or otherwise shaped to accommodate the insertion of pipe or tubing without forming a sharp interior ridge that might catch debris or accumulate material, and cause a clog or blockage. Freshly cut ends of pipe segments are carefully debarred to remove projecting slivers of material which may snag debris which can build up to cause blockages.


Slip-joint fittings are frequently used in kitchen, bathroom and tub drainage systems. They include a detached (movable) slip nut and slip-joint washer; the washer is made of rubber or nylon. An advantage of this of fitting is that the pipe it is connecting to does not need to be cut to a precise length; the slip joint can attach within a range of the end of the inserting pipe. Many slip fittings may be tightened or loosened by hand, for easier access to residential drainage.

In addition, a well-designed system will often use two 45° elbows instead of one 90° elbow  to reduce flow disruption as much as possible.


Central vacuum system inlet fittings are intentionally designed with a tighter radius of curvature than those of other bends in the system. If vacuumed debris becomes stuck it will jam at the inlet, where it is easy to find and remove.


A closet flange is a specialized flange designed to be flush with the floor, allowing a toilet to be installed above it.


The flange must be mechanically strong to accommodate slight misalignments or movements, and resist corrosion. Clean-outs are fittings with removable elements, allowing access to drains without the removal of plumbing fixtures.


They are used to allow an auger to clean out a plugged drain. Since clean-out augers are limited in length, clean-outs should be placed in accessible locations at regular intervals throughout a drainage system. Minimum requirements are typically at the end of each branch in piping, just ahead of each water closet, at the base of each vertical stack and inside and outside the building in the main drain or sewer. Clean-outs usually have screw-on caps or screw-in plugs. They are also known as “rodding eyes”, because of the eye-shaped cover plates often used on external versions.


A trap primer automatically injects water into a trap, maintaining a water seal to keep gas out of buildings. It must be installed in an easily accessible place for adjustment, replacement, and repair. A trap primer, a specialized valve, is usually connected to a clean-water supply. Because of the dual connection, it must be designed to resist the accidental backflow of contaminated water
A combination tee is a tee with a gradually curving central connecting joint. It is used in drains for a smooth, gradually curving path to reduce the likelihood of clogs, to ease the pushing of a plumber’s snake through a drain system and to encourage water flow in the direction of the drain.
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