The words “Chemical Warfare Service,” model numbers, serial numbers, lot numbers, weight, cubage, manufacturers’ names, contract number, and date of packing are indicated on the packing chest or the equipment. The numbers and letters shown on the equipment should be referred to when repairs are required. The tank group and the gun (without the fuel hose) may each be marked “M2” and the fuel hose may be marked “M1,” although all of these are components of the M2-2 portable flame thrower.
7. DIFFERENCES IN MODELS.
a. M2-2 and E3 portable flame throwers. Portable flame thrower M2-2 is identical in all important respects with portable flame thrower E3. (The E3 flame thrower, when standardized with some modifications, became the M2-2.) Operation and maintenance of the M2-2 and E3 are in general the same, and the parts are interchangeable.
b. M2-2, M1, and M1A1 portable flame throwers. Portable flame thrower M2-2 has the same fuel capacity but differs in construction from portable flame throwers M1 and M1A1. Parts are not interchangeable except as stated in Paragraph 8.
8. INTERCHANGING PARTS WITH M1 OR M1A1 FLAME THROWER.
To use an M2-2 gun with tank group (fuel unit) of an M1 or M1A1 portable flame thrower:
a. Remove fuel hose from M2-2 gun.
b. Screw a 3/4-inch by 1/2-inch pipe bushing into the side opening of the fuel-valve body. This bushing is furnished in the spare parts kit of each M2-2 portable flame thrower. ([Par 10])
c. Screw the fuel-hose assembly of the M1 or M1A1 flame thrower into the 1/2-inch opening of the bushing, using a wrench to make a tight connection.