Is one type fitting better than the other (compression versus push to fit) or is it just preference or ease of installation?
I have some air leaks on my coach and most seem to be coming from the push to fit fittings. I have replaced some of the ptf fittings with compression fittings. My research on this subject has only come up with the cheaper push to fit fittings for ease of installation.
jack
We had several new class 8 trucks that used push lock fittings, replaced most of them with compression fittings due to leaks. Not a fan of push locks.
They keep trying to invent the wheel.
Any stress from bends near the fitting or even vibrations could cause the push fittings to leak. Also over time the ends could get brittle and cause leaks. I prefer the DOT compression fittings. It is also possible to tighten the fitting if it leaks. Not possible with push fit other than cutting the end or replacing the fitting.
To get the reliability of compression fittings it's important to use DOT fittings that are made for the DOT tubing that is on our coaches.
Up until about a year ago I worked for a locomotive manufacture; they (and the industry a whole) do not allow push-to-fit fittings.
Here's an old post on the subject with details: Pulling Wheel Well Fenders for Air Bag Installation (http://www.foreforums.com/index.php?topic=31377.msg276671#msg276671)
I get my compression fittings from Freightliner. They go in easily and I have had no leakers. Have a great day ---- Fritz
Thanks to all for your responses. Your Foretravel and work experience and opinions are so important.
jack
Push to connect fitting work great on the shop floor where air line changes need to be made on a regular basis.
You also wrote "cheaper push to fit fittings" so I think you answered your own question. Use the compression fittings made for flexible tubing.
Grainger carries the Parker DOT fittings at a competitive price. Easy to pick up if you have one nearby or fast shipping.
Compression is the way to go. Push fittings are great for assembly lines where ease of construction is desired.
Keith
I have never had a problem with "push" fittings and we use them on our Fire Trucks. But we purchase brass, heavy duty push fittings. Used mainly for gauges and other accessories that come off the secondary air tank. I find them much easier to use, especially when you are in hard to reach areas. Make sure you use a proper airline cutter - the push on's need a clean straight edge.
Pat