Say goodbye to that plastic “fake rock” look forever with realistic Atlantic Water Gardens Rock Lids. Molded from real stones, the sturdy fiberglass construction, authentic textures and incredibly real finishes set these Rock Lids apart from other faux stones. Find the perfect fit for every application. No one will ever know it’s not real! RL40 models fit the PS4000, PS4500 or PS4600 skimmer, and measure 34"L x 24"W x 5"H.