Five Star DEF 38/400 DEF SPOUT for Diesel Exhaust Fluid Jugs Fits 38/400 size container necks and fits most DEF brand's 1 and 2.5 gallon DEF containers. Leak proof seal. Fits Five Star DEF FSD128VJ 1 Gallon Reusable DEF JUG. Spout swivels at cap for ease of use (Five Star DEF Exclusive). Precision cleaned and bagged and manufactured from High Density Polyethylene or Polypropylene for DEF compatibility. Length is 12 inches and tip fits most DEF Tank openings perfectly. Works great on larger filler necks too. Independent Lab Certified for DEF compatibility and over 100 Re-Uses.