Pneumatic Fittings & Threads FAQ

What size fittings do I have / need: 

Airline from the DC installed valve:

  • DC always ships our props/mechanisms/startle effects with a male 1/4" NPT threaded quick disconnect fittingTo connect this to your air compressors quick disconnect (female) coupler, please purchase and install a nipple fitting with female 1/4" thread that matches your quick disconnect.    Here is a reference photo, but please ensure the coupler you purchase fits your existing coupler. 

Cylinders - Generally DC uses 1/8" NPT elbow fittings with 1/4" airline. 

For larger cylinders (over 1.5" bore) the fittings will be 1/4" NPT and either the same 1/4" tube or possibly 3/8" tubing for large or complex animations. 

On Ankle Ticklers, Large Air Cannons, Under Water Air Cannons - those will vary between 1/4-1/2" NPT and 3/8-1/2" polyurethane tubing. 

If you have a question - please email us at info@dcprops.com and include a picture of your fitting and description/part number of your cylinder/valve and we will be more than happy to assist.

Measuring Thread Sizes

DO not assume the measurement matches the proper thread - pipe thread size does not refer to the inside or the outside diameters fitting/port. It refers to an industry designation (NPT - National Pipe Thread), not the actual size.

Listed below is a quick reference to help you to determine which size pipe fitting you need.

How to Determine Thread Sizes:

Use this thread image when ordering fittings with threads to help determine proper fit:

Finding the thread size with a tape measure

To determine the size of pipe fitting thread you need, first use a tape measure or scale to measure the inside diameter (ID) of the threaded port.  The following are measurements with their corresponding NPT size: 

  • 3/8" = 1/8" NPT
  • 1/2" = 1/4" NPT
  • 5/8" = 3/8" NPT
  • 3/4" = 1/2" NPT