Medallion Pools WA09042-8SKW 8' x 42" Plain Panel Wall with Inground Wide Mouth Skimmer Cutout at 5' Aluminum - Create the inground pool of your dreams with this Plain Panel Wall with Inground Wide Mouth Skimmer Cutout. It is constructed of durable aluminum. Aluminum is an ideal choice for inground pools due to its rust resistance. Aluminum's flexibility is able to handle water movement while its strength can withstand cold temperatures.