_j. Hose._ Flexible metal, rubber, and rubber-metal hose should be inspected regularly (at least four times a year) and discarded when noticeably deteriorated. _k. Toxic fumes._ Gasoline fumes are somewhat toxic and should not be inhaled. _l. Leaks._ Leaks must never be neglected, and the fact that gasoline is a dangerous liquid must always be kept in mind. Inspections for leaks should be made frequently, particularly at pipe and hose joints. _m. Fire extinguishers._ Carbon tetrachloride, carbon dioxide, or foam-type fire extinguishers should be provided and located where they will be accessible in the event of fire. Sand, not water, should be thrown on burning fuel if suitable extinguishers are not available. _n. Leaded gasoline._ Gasoline often contains a poisonous lead compound. Such gasoline, or fuel containing leaded gasoline, should not be allowed to touch the body, especially the lips, eyes, open cuts, and sores. Section IX OPERATION UNDER UNUSUAL CONDITIONS 41. WET CONDITIONS. The M2-2 flame thrower may be carried and fired successfully in the rain or even after short immersion in water. After use when wet, it should be dried to prevent rusting, cleaned, and lubricated. (Pars 49 and 55) Areas where paint has worn off should be touched up with fresh paint. The weapon should be stored in a dry place. Moisture must not be allowed to enter fuel, ingredients of fuel, or containers of ignition cylinders. 42. DUST AND MUD. Keep all possible dust, earth, and mud out of the flame thrower; particles may interfere with the operation of spring case, valves, bearings, and pressure regulator. Store weapons and auxiliary equipment in closed chests and boxes when not in use. (Par 77) Clean before use. (Pars 51 and 52) 43. HEAT. A hot climate or exposure to the sun makes the fuel thinner when in containers. Thin fuel has shorter range; it is largely consumed in the air before it reaches usual effective ranges. Where the climate is torrid, less gasoline or other thinning agents should be used in a fuel blend than normally. (Pars 34 through 36) 44. COLD. Cold weather reduces total heat produced at target but seldom enough to seriously lower value of a firing mission. Incendiary effects may be decreased because materiel is less flammable when cold. The weapon may be used at temperatures as low as minus 20 degrees Fahrenheit. To improve ignition, use more gasoline in fuel than normally. (Pars 34 through 36) 45. WIND. Flame throwers should not be fired into strong head winds or across strong side winds. (Par 23) Section X DEMOLITION TO PREVENT ENEMY USE 46. DESTRUCTION PROCEDURE. If circumstances should force abandonment of chemical warfare materiel in the field, it is destroyed or rendered useless to prevent its use or study by the enemy. The following methods are recommended: