Cover-Pools PPRDCHNL20X40 Raised Gunite Channel for Pools up to 20' x 40' - Cover-Pools standard channel is the most durable channel in the industry. It is composed of extra-thick gauge aluminum, which is primed and painted to withstand corrosion. The extra-long stem and two-shim system ensure that the track will remain secure. In addition, it contains two alignment pin channels to ensure the channel is straight during installation.