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Fox5flyer
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 Posted: Fri Oct 10, 2008 3:07 pm Post subject: Fuel drain, fuel filter, and a whatsit |
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In general terms, national pipe thread (NPT) means the threads are tapered.
The number, 1/8, 1/4, etc is the size of the ID of the pipe the fitting is
made for, but not necessarily the fitting. For example, a 1/4" galvanized
pipe with NPT threads is actually about 1/2" OD. ID is 1/4".
More confused now?
Deke Morisse
Mikado Michigan
S5/Subaru/CAP 397+ TT
"The aim of an argument or discussion should not be victory, but progress."
- Joseph Joubert
| Quote: |
The measurement won't mean a lot to a person new to pipe threads.
The easiest way to become familiar with the various sizes of NPT threads
is to visit the hardware store and buy one each of 1/8, 1/4, 3/8 and
1/2...you won't use the 1/2 or 3/8 much in our aircraft, I hope, except
for the header tank, I think...take 'em home, and compare the sizes to
what you need to order. That's cheating, but it'll get you to recognize
the various sizes. Oh, yeah, get males and females as well. Some places
have a label wrapped around the part, so I'd leave them right on the part
until you learn to just spot the size from experience. Eventually you'll
use the samples fixing the ol' house up. : )
Lynn Matteson
Kitfox IV Speedster
Jabiru 2200, 562 hrs, and counting...all systems are NOT go, and I'm back
to flying/testing/"guinea pigging"...damn it!
do not archive
On Oct 6, 2008, at 5:52 PM, Bob Brennan wrote:
> Ok - showing my ignorance here...
>
> The first picture is of the fuel drain for the wing tank which tends to
> leak and needs replacing. I got as far as http://
> www.aircraftspruce.com/catalog/appages/safair.php but the CAV-110, 160,
> 170, and 180 all look a lot like it. I know what an NPT thread is but
> where is the 1/4" or 1/8" measurement taken? Or the other measurements?
>
> Second picture is my fuel filter. Any suggestions on a replacement?
> Advance Auto Parts or Manny Moe &Jack ok?
>
> Third picture is the whats-it. Obviously a reservoir with some sort of
> lubricant which hasn't gone down since I have owned the plane. Obviously
> something I need to know about and service.
>
> Bob Brennan - N717GB
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