I have 3/8" copper tubing running from a 26 gallon air tank to an air horn. Since my truck is a cab-over, I needed to have a pivot point the would not fail when the cab tilted forward for maintenance.I used two, close-coupled in a swing-joint configuration beside the cab hinge.They have worked perfectly to date.For the price, I could not be happier.Good stuff. ??makes for a very neat and clean professional installWorks as describedGreat product great price.they work out good a bit high priced but what isn'tVery well made with high quality materials