A few words about hoses... In my humble opinion, the best type of hose to use is stainless steel braided. It's very strong, fairly flexible, and is available in a wide variety of lengths, sizes, and styles. You can also use steel brake line, or even hydraulic hoses. Just keep in mind, whatever type of hose or tubing you use, needs to have a working pressure of at least 800 psi. (Working pressure = 1/4 burst pressure, ie. 800 psi working pressure would be 3200 psi burst pressure) Liquid CO2 produces around 800 psi pressure, unless your tank gets very hot - then it can reach pressures of 1000 psi or more. Caution: Be very careful with the nylon or poly micro tubing and push-in fittings. Most of it only has a working pressure of 200-300 psi, which means a burst pressure of 800-1200 psi (The burst discs in your tank valve will blow at about 1300 psi). You could easily burst a tube with un-regulated CO2. |
Here is an overview of some of the more commonly used stainless steel braided hoses and fittings on paintball guns. |
NPT fittings are tapered, to facilitate sealing, although teflon tape is highly recommended. The fractional size of NPT fittings refer to the inside diameter of the corresponding pipe. In other words, 1/8" pipe has a 1/8" ID, etc. The size of the threads is actually larger - 1/8" NPT threads are closer to 1/4" outside diameter.
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One more thing about pipe thread fittings - you'll need to use Teflon tape to make sure they seal properly. Teflon tape is inexpensive, and can be purchased at most hardware and auto parts stores. Available in different widths, 1/2" is the most common. When you wrap your fittings, wrap the tape tight so that it pulls into the threads, put on at least two full wraps (don't put on too much, though), and wrap it in a clockwise direction. I hold the roll of Teflon tape in my left hand, and rotate the fitting clockwise to wrap it. Also pictured here is another handy item - leak detector. Leak detector is nothing more than soapy water. When applied to installed fittings, it will discover small leaks by "bubbling" where the gas is leaking. You can make your own by putting a few drops of dish detergent in a cup of water, and stirring it up well. |
My personal favorite for hoses are the AN style. Also known as JIC, they are a 37 degree flare fitting. Easy to install due to the swivel nuts on the hose. Shown are AN-04 size hose and straight male adapter (1/8" NPT male to male AN-04). The pipe thread adapter is installed in the component (bottomline, ASA reducer, etc.) then the hose nut is screwed onto the adapter. The cheapest source I've found for AN style braided hoses is Paragon Performance. The hoses I've purchased are between $6-$8. They also have blue anodized aluminum adapters. |
Three of the most common lengths of AN-04 hoses used in paintball. (top to bottom) 12", 10", 8". |
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