The apparatus applies caps to the vertical outlets of valve heads on compressed or liquified gas bottles which are conveyed by turntables able to position the outlets in the correct vertical plane. Reciprocable within this plane is a head which carries a pair of arms pivoting about an axis perpendicular to the plane. The arms have curved ends such that on contact with the valve head the arms pivot and correctly position a vertically moving head carrying the caps. The latter head is reciprocated horizontally and has pairs of jaws which compress axially extending arms of the cap around the outlet and secure a locking ring, the ring being cut from an annular extension at the head of the cap and moved over the arms.
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