Cover-Pools PPVLCHNL20X40 Track Channel with Vinyl Retainer for Pools up to 20' x 40' - Track channel with vinyl retainer is a combination of track channel and vinyl-liner receiver that can be used with coping forms for any of three profiles. The channel provides the same benefits as standard channel and is composed of extra-thick gauge aluminum, which is primed and painted to withstand corrosion. The extra-long stem and two-him system ensure that the track will remain secure.