Detailed Description
Feed Water Adapter 3/8" & 1/2"
Our RO feed water adapter fits both standard 1/2 inch or 3/8 inch faucet pipes. The adapter output to standard ¼" OD tubing using a compression fitting and has a shut off valve for servicing to water filter. Lead and BPA free.
Common American National Standard Pipe Taper Threads:
- NPT - National Pipe Thread Taper (ANSI/ASME B1.20.1)
- NPTF - Dryseal American National Standard Taper Pipe Thread (ANSI B1.20.3)
NPT threads may be referred to as MPT ('Male Pipe Thread'), MNPT, or NPT(M) for male (external) threads, and FPT ('Female Pipe Thread'), FNPT, or NPT(F) for female (internal) threads. Note that FPT and MPT are not authorized designations per the ANSI standard.
For NPT threads a sealant compound or Teflon tape must be used for a leak-free seal. For NPTF no sealant is needed for a leak tight connection.
Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose):
- Tapered Thread 1°47'
- Truncation of Roots And Crests Are Flat
- 60° Thread Angle
- Pitch Is Measured In Threads Per Inch
Note: Pipe sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. A 3/4" NPT pipe thread has an outside diameter - OD - of 1.050 inches.
Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4" NPT pipe thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive identification of thread size because more than one size have the same TPI.
| NPT - American Standard Pipe Thread Taper‡ | ||||||
| Pipe Size (inches) | Threads per Inch TPI - pitch | Approx. Length of Thread (inches) | Approx. # of Threads to be Cut | Approx. Total thread Makeup, Hand and Wrench(inches) | Nominal Outside Pipe Diameter OD (inches) | Tap Drill (inches) |
| 1/16" | 27 | 0.313 | ||||
| 1/8" | 27 | 3/8 | 10 | 1/4 | 0.405 | R |
| 1/4" | 18 | 5/8 | 11 | 3/8 | 0.540 | 7/16 |
| 3/8" | 18 | 5/8 | 11 | 3/8 | 0.675 | 37/64 |
| 1/2" | 14 | 3/4 | 10 | 7/16 | 0.840 | 23/32 |
| 3/4" | 14 | 3/4 | 10 | 1/2 | 1.050 | 59/64 |
| 1" | 11-1/2 | 7/8 | 10 | 9/16 | 1.315 | 1-5/32 |
| 1-1/4" | 11-1/2 | 1 | 11 | 9/16 | 1.660 | 1-1/2 |
| 1-1/2" | 11-1/2 | 1 | 11 | 9/16 | 1.900 | 1-47/64 |
| 2" | 11-1/2 | 1 | 11 | 5/8 | 2.375 | 2-7/32 |
| 2-1/2" | 8 | 1 1/2 | 12 | 7/8 | 2.875 | 2-5/8 |
| 3" | 8 | 1 1/2 | 12 | 1 | 3.500 | 3-1/4 |
| 3-1/2" | 8 | 1 5/8 | 13 | 1 1/16 | 4.000 | 3-3/4 |
| 4" | 8 | 1 5/8 | 13 | 1 1/16 | 4.500 | 4-1/4 |
| 4 1/2" | 8 | 5.000 | 4-3/4 | |||
| 5" | 8 | 1 3/4 | 14 | 1 3/16 | 5.563 | 5-9/32 |
| 6" | 8 | 1 3/4 | 14 | 1 3/16 | 6.625 | 6-11/32 |
| 8" | 8 | 1 7/8 | 15 | 1 5/16 | 8.625 | |
| 10" | 8 | 2 | 16 | 1 1/2 | 10.750 | |
| 12" | 8 | 2 1/8 | 17 | 1 5/8 | 12.750 | |
| 14" | 8 | 14.000 | ||||
| 16" | 8 | 16.000 | ||||
‡ The taper is 1/16 inch in an inch, which is the same as 3/4 inch in a foot (angle 1°47')
NPT threads are not interchangeable with NPS - National Pipe Straight - threads.
NPT threads may look similar to ISO 7/1 threads. However, ISO and NPT threads should not be mixed. ISO threads have 55° taper angle versus 60° for NPT. The NPT root and crest configurations are also different from ISO. For ISO threads pitch is usually measured in millimeters (may be expressed in inches). Thread pitch are also different.
