The Arch or Y base casting covers the Curb Stop without being mechanically connected. When required, a stationary shut-off rod is attached (via cotter pin) to the tee head of the Curb Stop and remains in place inside the Curb Box. The top of the shut-off rod is formed in such a manner that it centers the top of the rod inside the upper section of the 1 in Curb Box. Stationary shut-off rods are furnished with Curb Boxes having 1 in upper sections and are also available separately.