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We now carry lead free fittings: Lead Free Valves, Lead Free Brass Fittings,
Lead Free Brass Pipe Nipples, Lead Free Pex Fittings and Lead Free Pushfit Fittings!
Copper Fittings DWV Fittings Valves Brass Fittings Brass Pipe Nipples Black Malleable Fittings Black Pipe Nipples Galvanized Fittings Galvanized Pipe Nipples PEX Fittings PEX Tubing Pushfit Fittings Press Fittings Pressure Gauges Grease Traps View Store Cart Everyday Low Prices Right Here at Plumbing Fittings Direct!
 Plumbing Terms and Definitions



Ball Valve - A valve that uses a ball to seal against the seat.

Brass Fittings - A plumbing fitting made of brass.   View List

CO - Cleanout

Cock - A faucet or valve for regulating the flow of water.

Copper Fitting - A plumbing fitting made of copper.   View List

Coupling - Vent pipe hood, which protects it from the elements.

DWV - Drainage, waste, and vent systems, which remove wastewater. Not for drinking water.

FIP - Female Iron Pipe connection. Standard internal threads on pipe fittings.

Galvanized Fittings - A plumbing fitting made of galvanized metal.    View List

IPS (Iron Pipe Size) (OD) - Same as NPS. Standard pipe threads. Also Internal Pipe Swivel connection (female)

OD - Outside diameter    View Nominal to OD Equivalence

MIP - Male Iron Pipe Connection. Standard external threads on pipe and fittings.

Nipple (Pipe Nipple) - A short length of pipe installed between couplings or other fittings

Nominal - Usually refers to the Inside diameter of trade sizes of copper pipe and some CPVC pipes. Not for Iron Pipe connections. For example, a " NOM Comp. Fitting is actually 5/8" because " pipe has an OD of 5/8".

   View Nominal to OD Equivalence

NPS - National Pipe Straight threads standard, Same as IPS

PEX - Cross-linked polyethylene. PEX tubing is commonly used for hydronic radiant floor heat, but increasingly also used for water supply lines. Stronger than PE.

Plumbing Fitting - The component in a plumbing system that connects two or more pieces of pipe together.

PVC - Polyvinyl Chloride. A plastic plumbing material used primarily for yard service pipe, outdoor irrigation systems or interior drain, waste and vent systems. This material is typically white or black.

Reducing - A fitting that connects pipes of different sizes together.

Sillcock - Hose bib

Union - Three piece fitting that joins two sections of pipe, but allows them to be disconnected without cutting the pipe. Used primarily with steel pipe; never in a DWV system.

Valve - A device used for turning the water supply on and off. Often referred to as "stops."    View List

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