This video shows everyday applications of each crude oil product, from car fuel and jet fuel to petrochemicals and asphalt.
Compress Natural Gas (CNG) is now an evolving market in crude refraction too, however this market is still very much untapped and most vehicles are not factory built to utilize CNG.
No vent = weak flow, vent = smooth flow. A simple vent pipe can fix airlock issues and improve water movement in your plumbing. Small fix, big difference in flow.