The 1 1/2 x 4000 gauge is the supply pressure for oxygen regulators. It has a 1/8" NPT inlet fitting.
Automatic Twin Welding Hose Reel 50' Hose
13 x 25 Large Cylinder Tank Cart 14" Wheels
Manual Twin Welding Hose Reel
9 3/4 x 17 3/4 Tank in Front Cylinder Cart
1/4 x 100 Grade T Twin Welding Hose