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Measuring and Gaging Use seat-to-seat versus Overall Method because the nuts will move and change the measured length. Use the center line of fitting gage point on elbow fittings. Orientation – Hold hose in front of you with near elbow pointing down towards six o’clock. Measure counter-clockwise to rear fitting position. Example: Rear fitting pointing at 9 o’clock is 270 degrees. Fitting Size Caution: Measure both ends! Hose fitting size may differ from one end to the other If you don’t have a thread gage, a hex wrench can be used to help identify the fitting nut size.

Hose Size Teflon hose and some rubber hose is measured as tube size not true inside diameter. The hose is specified by the outside diameter of the tubing. A size -6 medium pressure Teflon hose is a nominal 3/8” with a .298 ID. The difference is important for critical flow applications such as a turbo injector lubrication line. Always check with the manufacturer of the equipment before changing hose types.