Abstract: An apparatus including a main support block of a generally parallelepiped cross-sectional configuration defined by a central bore directed therethrough, wherein the central bore receives and protects a sprinkler head in a surrounding relationship and wherein the central bore includes a knock-out section of the central bore to enlarge the central bore to increased area to receive a larger sprinkler head therewithin. The invention includes a modification wherein the main support block includes a secondary support block structure to permit stacking, with the secondary support block including projections at corners of the support block directed downwardly therefrom receivable within registration bores coaxially aligned with the projections to permit stacking of the organization to a predetermined height. The secondary support block may be formed of an absorbent stone or polymeric to permit absorption of various chemicals such as weed killer and the like to limit weed and grass growth overlying the organization.