PVC pipes and fittings all have different dimensions based on the nominal size (the “name” of the pipe, which often isn’t the actual measured size) and whether they are schedule 40 or schedule 80.
Below are the dimensions for schedule 40 PVC pipes and fittings, the most common type for residential use, for sizes between 3/4″ and 2.5″. (Note PCV DWV dimensions follow this table)
1. 3/4″ PVC Pipe: Inner diameter (ID) 0.824″ and Outer diameter (OD) 1.050″
3/4″ PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 3/4″ pipe.
2. 1″ PVC Pipe: Inner diameter 1.049″ and Outer diameter 1.315″
1″ PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 1″ pipe.
3. 1.25″ PVC Pipe: Inner diameter 1.380″ and Outer diameter 1.660″
1.25″ PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 1.25″ pipe.
4. 1.5″ PVC Pipe: Inner diameter 1.610″ and Outer diameter 1.900″
1.5″ PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 1.5″ pipe.
5. 2″ PVC Pipe: Inner diameter 2.067″ and Outer diameter 2.375″
2″ PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 2″ pipe.
6. 2.5″ PVC Pipe: Inner diameter 2.445″ and Outer diameter 2.875″
2.5″ PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 2.5″ pipe.
Please note that these dimensions may vary slightly based on the manufacturer and the specific type of pipe (e.g., pressure-rated vs. non-pressure-rated, etc.). If you require precise dimensions for a specific application, I recommend checking the technical specifications of the specific product that you plan to use.
Drain, Waste, and Vent (DWV) PVC pipes use a different standard called “SDR” or Standard Dimension Ratio. The sizes are not exactly the same as the schedule 40 pipes, but they are similar. Here’s a list of the dimensions for PVC DWV pipes between 3/4″ and 2.5″:
1. 3/4″ DWV PVC Pipe: Inner diameter (ID) 0.804″ and Outer diameter (OD) 1.050″
3/4″ DWV PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 3/4″ pipe.
2. 1″ DWV PVC Pipe: Inner diameter 1.029″ and Outer diameter 1.315″
1″ DWV PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 1″ pipe.
3. 1.25″ DWV PVC Pipe: Inner diameter 1.360″ and Outer diameter 1.660″
1.25″ DWV PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 1.25″ pipe.
4. 1.5″ DWV PVC Pipe: Inner diameter 1.590″ and Outer diameter 1.900″
1.5″ DWV PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 1.5″ pipe.
5. 2″ DWV PVC Pipe: Inner diameter 2.047″ and Outer diameter 2.375″
2″ DWV PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 2″ pipe.
6. 2.5″ DWV PVC Pipe: Inner diameter 2.445″ and Outer diameter 2.875″
2.5″ DWV PVC Fittings: Inner diameter varies depending on the fitting type but is designed to fit the OD of 2.5″ pipe.
Please note that these dimensions can vary slightly based on the manufacturer and the specific type of pipe. Always check the technical specifications of the specific product you plan to use if you require precise dimensions.
In plumbing, MPT and MIPT essentially refer to the same thing. Both acronyms represent “Male (Iron) Pipe Thread.”
MPT stands for Male Pipe Thread, while MIPT stands for Male Iron Pipe Thread. The “Iron” in MIPT is a bit of a historical holdover from when most pipes were made of iron. It’s used to refer to the standard type of pipe thread used in the United States, which can be used with pipes of materials other than iron, including PVC, brass, bronze, and more.
In both cases, they refer to the external threading on a pipe or pipe fitting that is intended to screw into a female (FPT or FIPT) threaded pipe or fitting.
Whether the fittings are PVC, iron, brass, or some other material, the terms MPT (Male Pipe Thread) and MIPT (Male Iron Pipe Thread) refer to the same type of threading.
These terms are used interchangeably in the plumbing industry.
The designation denotes the style and dimensions of the thread, which are standardized to ensure a secure, leak-proof connection when mated with a corresponding FPT (Female Pipe Thread) or FIPT (Female Iron Pipe Thread) fitting.
So, an MPT fitting made from PVC should thread correctly into an FIPT fitting, regardless of whether the FIPT fitting is made of PVC, iron, brass, or another material, as long as they are the same nominal size.
In PVC plumbing, MPT (Male Pipe Thread) and SPG (Spigot) refer to different types of end connections of the pipe or fitting.
1. MPT (Male Pipe Thread): This end has external threading and is designed to screw into a corresponding FPT (Female Pipe Thread) fitting. An MPT connection is typically used when you need to be able to disconnect and reconnect the fitting.
2. SPG (Spigot): A spigot end is the same diameter as the pipe and it fits inside a socket or slip (S) fitting. This type of connection is typically glued using a special PVC cement and is intended to be permanent.
Therefore, the primary difference between MPT and SPG connections in PVC plumbing is that MPT connections are threaded and meant for connections that may need to be disconnected at some point, while SPG connections are meant to be glued into a fitting and are permanent.