G. (Added). 3 Locknuts, pipe, hex, 1/8-inch, H98-5-382 (for use with deflector tube). (See fig. 39.) H. (Added). 1 Support, diaphragm, A81-1-428. (See fig. 47.) =12. NEW EQUIPMENT.= * * * * * _m._ (Added). New gun may be received with valve spring removed from barrel and valve assembly. Spring comes tied to barrel. This is done to prevent strain on valve diaphragm assembly caused by pressure of spring in gun during storage and shipment. When weapon is being prepared for operation, spring must be untied from barrel and installed in gun, as described in paragraph 75. _n._ (Added). Pressure regulator may be shipped at zero adjustment to prevent possibility of strain on diaphragm during shipment and storage. A regulator shipped in this condition has a tag (tied to the tank coupling) stating that the regulator is not set. When weapon is received in this condition, it must be adjusted as described in paragraph 67 before it can be operated. Footnote: =*These changes supersede TB 3-376A-1, 19 October 1944.= =15. TRAINING.= * * * * * _b. Use of water in training._ Water may be used (instead of fuel) for elementary practice firing. Ignition cylinders are * * * piece, and lubricated (Par. 49). =Use of water, however, should always be supplemented by firing ignited fuel because water does not give a correct impression of stream and flame characteristics.= * * * * * =17. CONNECTING TANK GROUP AND GUN GROUP.= * * * * * _a._ Place the new * * * to 2 minutes. =Slight pressure sometimes builds up in the fuel tanks, even though the pressure-tank valve has not been opened, and causes some overflow of fuel when the coupling plug is removed. This pressure may be relieved by—= =(1) Standing the tank group upright.= =(2) Slightly opening filling plug on top of fuel tanks to bleed the pressure.= =(3) Closing the opening at filling plug and tightening it with wrench.= * * * * * =18. LOADING WITH IGNITION CYLINDER.= * * * * * _b. Precautions._ Care must be * * * front of gun. =Do not ignite the ignition cartridge until the weapon is to be fired at the target.= * * * * * =30. AFTER FIRING.= When the firer * * * mission, he should: _a._ =First=, remove and discard the ignition cylinder, =as the ignition cylinder should never be present when blowing out fuel or after blowing out fuel except when preparing for a new mission. To remove cylinder, proceed= as follows: * * * * * _b._ Close the pressure-tank valve by turning valve handle clockwise (to conserve remaining pressure in pressure tank) =only if additional shots are to be fired before refilling and recharging=.