FIELD: shipbuilding. SUBSTANCE: patch includes cover, rocker arm, hollow cylinder, handle and hold-down nut. Rocker arm is provided with detachable supports. One support is located on extensible hollow cylinder mounted on bush of cover and fitted with splines received by slots of bush, cut and seat for second support. Second support is located on movable axle passing through bush and having screw at cover outlet. EFFECT: enhanced reliability. 1 dwg
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