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"If there be any among us who [disagree], let them stand undisturbed as monuments of the safety with which error of opinion may be tolerated, where reason is left free to combat it." Thomas Jefferson, March 4, 1801
"3 way" "Side Outlet 90" and "PVC Corner" all mean the same thing. A PVC fitting with 3 ports, one on each of the X, Y, and Z axis. You can find them here.
"4 way" and "Side Outlet T" all mean the same thing. A PVC fitting with 4 ports, two on Y axis and one each on the X and Z axis. You can find them here.
"5 way" and "Side Outlet Cross" all mean the same thing. A PVC fitting with 5 ports, two X axis, two on the Y axis, and one on the Z axis. You can find them here.
What's a "funnel" or "bell?" These are reduction or reducing couples. Slip socket on both ends. For them to be called funnels or bells there will be a great difference between sizes, for example, 2" on one side and 1/2" on the other. You can find them here.
"Slip" "Slip Socket" and "Socket" all mean the same thing. The pipe glues into it. A 'female' end. The exception to this is a "Slip T" in which case the "Slip part" slides over pvc pipe. It's used in construction projects as hinges or parts that need to move or slide.
"St" "Street" "Spg" and "Spigot" all mean the same thing. It glues into another fittings socket. A 'male' end. Note: There are both threaded street fittings and glue in street fittings. The street, spigot, st or spg just refers to the mechanism, not whether it's threaded or glued in.
"MPT" and "MIPT" all mean the same thing. Male Iron Pipe Thread.
"FPT" "FIPT" all mean the same thing. Female Iron Pipe Thread.
"NPT" means National Pipe Thread. Sometimes you may see this as NIPT which is Nation Iron Pipe Thread, however we don't use it because it confuses people. They think the fitting is made of iron when in fact it's plastic. All fittings used to be iron or steel, but most have been replaced with plastic or brass. But they still use the same threads. Also you will see FNPT or MNPT or FNIPT or MNIPT. All of these are referring to the same thing, just M=Male and F=Female.
"NSF" See https://www.nsf.org/business/about_NSF/ An agency that inspects and approves plumbing parts. You can't use a part in a plumbing project that has to be inspected by a state, city or county official unless it's got an NSF or other certification body acceptance. Similar to IAPMO, UL, etc.
Proper Tee fitting notation: All Tees are are specified like this: Top left by Top right, by Center. However if all 3 sides of a Tee are the same, just specify one number, ie, 1.5" T. However, if the sides are not all the same, then you specify it like this: 1" by 1" by1.5". That would describe a bull head Tee with 1" on the left and right ports and a 1.5" in the center. If it's a particular bullhead Tee with a 1.5" spigot in the middle, then you might say 1" by 1" by 1.5" spigot. If you don't qualify the port, then it's assumed to be a slip fitting. If it's a Tee with one port threaded, you might say something like 1" by 1" by 3/4" FPT. Meaning the top left and right ports are 1" slip socket and then the center is a 3/4" port with FPT (Female Pipe Threads.)
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