_a. Description and functioning._ (Fig 47) The valve grip is part of the fuel valve. It includes the controls and is held by the firer in his right hand to support the gun group. Parts of the valve grip are: (1) _Left and right valve grips._ A pistol-type grip is formed by two aluminum housings designated as the left valve grip and the right valve grip. The two parts are held together by four screws and four lock washers. (2) _Grip support._ This aluminum housing is mounted above the left and right valve grips and connected to them by two screws and lock washers. (3) _Valve lever._ This control is made to fit the fingers and is mounted in front of and between the two parts of the valve grip. A pin at the top of the lever fits into holes in left and right valve grips and serves as a pivot, governing the movement of the lever. When the lever and the grip safety are compressed simultaneously by the operator, the valve is thereby opened and fuel is ejected from the gun. (4) _Grip safety._ This control is grasped by the hand simultaneously with the valve lever. It is mounted back of and between left and right valve grips. A pin at the base of the safety fits into holes in the left and right valve grips and serves as a pivot in a manner similar to the pin on the valve lever. The fuel cannot be discharged unless both the valve lever and the grip safety are compressed simultaneously. (5) _Rocker arm._ The rocker arm, a boat-shaped metal part, is mounted near its center on a pin. It is held in contact with the valve lever by means of a valve-grip spring and spring pin. At its top end, the rocker arm touches the yoke shaft of the valve-diaphragm assembly. When the valve lever and the grip safety are compressed, the rocker arm pushes the valve diaphragm assembly forward. (6) _Valve-grip spring._ When the firer’s hand releases the valve grip, the valve-grip spring forces the valve lever, the grip safety, and the rocker arm back to their normal, nonoperating positions. _b. Removal of valve grip._ (1) Unscrew the four screws and lock washers that hold the grip support to the valve body. Remove the valve grip as a unit. [Illustration: Fig 47. Fuel valve (disassembled) and fuel hose, showing nomenclature and Chemical Warfare Service stock numbers for requisitioning spare parts.] [Illustration: Fig 48. Location of parts in right valve grip before covering them with left valve grip.] [Illustration: Fig 49. Using screw driver to push long end of valve-grip spring into groove in grip safety.] (2) To disassemble valve grip, remove screws and lock washers from the grip. Lift off the left valve grip, exposing contents of grip. Lift out the following parts: valve-grip spring, rocker arm, grip safety, and valve lever. _c. Installing valve grip._