Method and apparatus for replacement of lawn sprinkler units

A process for replacing a lawn sprinkler unit emplaced in a vertical hole in soil underlying a lawn, said lawn sprinkler unit comprised of a tubular housing component having a bottom extremity with an axially centered internally threaded aperture and a top extremity threadably interactive with a head component having means for emitting water radially outward, said lawn sprinkler unit being removably joined to an underground horizontally extending water conduit by way of a riser pipe upwardly directed from said conduit and terminating in a male threaded extremity adapted to engage the internally threaded aperture of said housing component, said process comprising:

• 1) axially twisting said head component, releasing the head component from said housing component, and lifting and removing said head component,
• 2) inserting downwardly through said housing component a rigid cylindrical rod, causing the lower extremity of said rigid cylindrical rod to penetrate said internally threaded aperture and enter said riser pipe in close fitting engagement therewith,
• 3) axially twisting and upwardly removing said housing component in sliding engagement with said rigid cylindrical rod, during which action of said rigid cylindrical rod prevents soil from entering said conduit,
• 4) installing a new, substantially identical housing component by downward sliding motion along said rigid cylindrical rod, whereby said rigid cylindrical rod provides alignment of said male threaded extremity of the riser pipe with the internally threaded aperture of said housing component, and axially twisting said new, substantially identical housing component to produce secure engagement with the male threaded extremity of said riser pipe,
• 5) upwardly removing said rigid cylindrical rod from said secured housing component, and
• 6) installing a new, substantially identical head component by axial rotation to cause interengagement with the top extremity of said new, substantially identical housing component.