Edema has many possible causes: 1  Prolonged standing or sitting, especially in hot weather, can cause excess fluid to accumulate in the feet, ankles and lower legs. 2  Tiny valves inside the veins of the legs can become weakened, causing a common problem called venous insufficiency.
Cars with nitrous-equipped engines can be identified by the purge of the delivery system that most drivers perform prior to reaching the starting line. A separate electrically operated valve is used to release air and gaseous nitrous oxide trapped in the delivery system.
9 Customer Reviews. NOS offers DOT-approved nitrous bottles in a variety of sizes and finishes to suit your needs. The bottles come with an NOS/CGA-approved high-flow valve and built-in siphon tube. For extra safety, NOS has designed an exclusive blow-off venting system. If your bottle is overfilled or if pressure increases beyond the maximum safety level, the vent opens and discharges the nitrous into a safe place.