Hayward Vinyl or Fiberglass Cycolac Skimmer Sq/ Cover Auto Skim™ Series skimmers are molded of rugged, non-corrosive ABS and have no joint below water level. They feature a cover collar allowing 1 1/2" vertical adjustment and a snap-in-weir that automatically adjusts to 4-1/2" variation in water level. An optional float/by pass valve is available. Hayward Vinyl or Fiberglass Cycolac Skimmer Auto Skim™ Wide Track Series skimmers are molded of durable, non-corrosive ABS. A wide 15-1/2" skimmer face opening allows for maximum skimming action. They feature a cover collar allowing 1-1/2" vertical adjustment and a snap-in weir that automatically adjusts to 4-1/2" variation in water level, and a 163 cubic inch basket. An optional float/by pass valve is available.