I am looking to purchase a 1'' RTO drop pipe pitless adapter

I am not in this field, but when I saw it done, there was a cable that attached to that arm. Maybe the cable fell into the casing. See if there is anything attached. The cable is then pulled/jerked hard upward to release the arm.

Write back,
Gary

Hi there,
What does the other end of the adapter look like?
Is it a conventional circular one or is it a special port like it's thin square like or USB like maybe?
If it's conventional any 10v 1.8amp or 2 amp output should do and a lot of them are available in e-bay or if there's a Best Buy, Staples, Etc near you can just drop a visit purchase one and it should work like a charm.
However if it's not a conventional adapter you may have to contact philips and purchase one that is compatible from them.
Hope this shed some light on your problem!

Common American National Standard Pipe Taper Threads

• NPT - National Pipe Thread Taper
• FPT - female (internal) National Pipe Taper threads
• MPT - male (external) National Pipe Taper threads
• NPTF - Dryseal American National Standard Taper Pipe Thread (ANSI B1.20.3)

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 sealing.
Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose):

• tapered thread 1o 47'
• truncation of roots and crests are flat
• 60o 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 1) Pipe Size
(inches) Threads per Inch
TPI - pitch Approximate Length of Thread (inches) Approximate Number of Threads to be Cut Approximate 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 1) The taper is 1/16 inch in an inch, which is the same as 3/4 inch in a foot (angle 1o 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 55o taper angle versus 60o 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 Inch). The pitch are different.

depends on the distance between the source and the unit