The 1/4"OD/.170"ID Tube X 1/4"OD/.170"ID Tube Dubl-Barb® Brass Union Elbow is .63" center line to end and has a .120" flow diameter. A compact one piece, push-on hose barbed fitting for a quick, economical way to connect polyethylene tubing. These fittings are designed for use with polyethylene tubing. 1/4" to 3/8" sizes are rated up to 150 PSI and withstand temperatures between -65°F to 90°F. 1/2" size is rated up to 100 PSI and withstands temperatures between -65°F to 75°F.