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Saddle Valve - A valve mounted on a pipe run by a clamping device, or fitting that taps into the side of a pipe, used to make quick connection to an existing line to provide a water supply for a low-demand device.
Sanitary Sewer - House drain that carries wastewater away from the house to a sewer system or septic tank.
Self-Rimming Sink - Sink with no metal ring that has a built-in lip of the same material which supports it in the vanity top.
Service Entrance - Pipe connecting the water company piping to the water meter.
Setting - Pumps' vertical distance in feet from the top of the well to the top of the pump.
Shroud - Color-matched component under a wall-mount lavatory that covers the drain outlet for aesthetic purposes.
Siphon-Vortex Water Closet - A toilet having a trapway at the rear of the bowl, integral flushing rim, and a water supply system with or without a jet, which does not feed directly into the trap.
Sleeve - Pipe which is passed through a wall for the purpose of inserting another pipe through it.
Slip Joint - A connection made with compression fittings.
Soil Stack - Largest vertical drain line to which all branch waste lines connect. This line carries waste to the sewer line.
Solder - Metal alloy that is melted to create a fused joint between metal pieces. Also the act of melting solder into the joint.
Spud - A threaded opening on the water heater tank. Also a tool for digging having characteristics of a shade and chisel.
Stack - The vertical main in the drain, waste, and vent system, extending one or more stories.
Stand Pipe - Open vertical pipe that receives water from a washing machine. Also the vertical pipe run supplying water to a fire sprinkler system; also large vertical pipe into which water is pumped in order to produce a desired pressure; a high vertical pipe or reservoir that is used to secure a uniform pressure in a water-supply system.
Static Lift - The vertical distance between source and discharge water levels in a pump installation.
Stop Valve - The shutoff valve under sinks and toilets. Allows water supply to be cut off to one fixture without affecting the water supply to other fixtures.
Straight Cross - Fitting that connects four pipes of the same diameter.
Sump - A pit or pool for draining, collecting, or storing water. A chamber which provides water to the pump.
Sweating - Slang term for soldering. Also formation of condensation on the outside of pipes or toilet tanks.
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