There is one part you'll never find at GT Southwest Hose: the one that wasn't tested! Every single hose in our Weld Shop undergoes a 150-PSI submersible air test. This important test confirms there are no leak paths from the welding process. Our Hydrostatic and/or Nitrogen Test, when only the most precise readings will do, simulates working pressure to 150% of your application with testing as high as 8,000 PSI. Finally, all our welders use a constant flow of Argon to purge the weld and avoid burn-through. When it comes to Quality Control, GT Southwest Hose aces the test.