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Definitions of commonly used abbreviations:

Slip

Slip on connection, must be glued

Fipt

Female Iron Pipe Threaded

Mipt

Male Iron Pipe Threaded

Spig

Spigot, has same dimensions as pipe of the same size

Insert

A Barbed fitting used with Polyethylene pipe and a clamp

TBE

Threaded Both Ends

UVR

Ultraviolet Resistant (for use in direct sunlight)

Nipples

A length of pipe that is threaded on both ends

CPVC

Chlorine added PVC for increased strength at higher temps.


What does Fipt, Mipt, Spig, and Slip mean and how do I know which one to use?

All PVC Fittings have connections that are called either FIPT (Female Threaded), MIPT (Male Threaded), Slip (Female Glue Joint), or Spig (Male Glue Joint). See Details below.

FIPT: This means the fitting is threaded on the inside (female) and will accept a threaded piece of pipe (male) of the same dimension. .
MIPT: This means the fitting is threaded on the outside (male) just like the end of a piece of pipe. This connection must go to another fitting that is a Fipt (female) threaded. You cannot connect a Mipt Fitting to a piece of pipe without another fitting, since they are identical in configuration. .
Slip: This is a smooth (not threaded) female fitting that will accept an unthreaded piece of pipe of the same size, which must be glued in.
Spig: This is a smooth (not threaded) male fitting that is made to go into another fitting that has a Slip connection of the same size, which must be glued in. A Spig fitting is the same as a piece of unthreaded pipe of the same size. You cannot connect a Spig Fitting to a piece of pipe without another fitting, since they are identical in configuration.


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