Abstract: An improved sprinkled warehouse stacker rack in which the sprinkler system is an integrated portion of a rack structure. A plurality of load bearing side frame members of any given heighth are operably interconnected to provide a stable structure having a plurality of load receiving cells. A sprinkler system comprised of a plurality of pipe members, each having a length, such that when assembled to connect a pair of side frame members, a load receiving cell of a predetermined width is created. A clamp for providing limited tri-axial movement of a sprinkler pipe is disposed on each of the side frame members and is adapted to co-act with the end of a sprinkler pipe to operably engage the same and to horizontally space the side frame members while permitting vertical and horizontal misalignment to accommodate normal construction tolerances.