Description Dreamworks Fuel Tank Fitting High Flow Dreamworks Fuel Tank Fitting with High Flow Barbs Thread in style fuel tank fitting.  New one peice fitting design with barbs machined into the insert.  Can be bonded internally or externally to tank. 1 complete fitting per package. Opening I.D. – .51in (13mm) Opening O.D. – .66in (17mm) (meaning tank will have to have a 17mm hole) Barb O.D. – .23in (5.8mm) Fits XL (3/16″) Tygon. Uses the same size barb fittings as found on our High Flow Startup Overflow Vent Systems (RCF69001HF). Vent Fitting Not Included. Note: Color may Vary.