Abstract: A sprinkler construction for mounting on any upwardly inclined forward end of the compactor plate of vibratory plate compactors for delivering water to the surface of the compactor plate which contacts material being compacted. The sprinkler construction comprises a hollow bar having an open rear side in contact with the plate which forms a closure for the open rear side and form a longitudinal chamber in the sprinkler bar. The bottom edge of the open rear side of the hollow sprinkler bar is provided with recesses which cooperate with the compactor plate to provide water discharge slots for discharging water along the surface of the compactor plate. The hollow sprinkler bar is removably mounted on the compactor plate to enable easy removal for cleaning the sprinkler bar from any debris that may accumulate therein. The hollow sprinkler bar is communicated with a water supply tank mounted above the compactor plate for gravity flow of water to the sprinkler bar controlled by a valve.